diff --git a/src/bin/start-keycloak/getQuayIoKeycloakDockerImageTags.ts b/src/bin/start-keycloak/getQuayIoKeycloakDockerImageTags.ts
new file mode 100644
index 00000000..e36e7ae8
--- /dev/null
+++ b/src/bin/start-keycloak/getQuayIoKeycloakDockerImageTags.ts
@@ -0,0 +1,89 @@
+import fetch from "make-fetch-happen";
+import type { BuildContext } from "../shared/buildContext";
+import { assert } from "tsafe/assert";
+import { z } from "zod";
+import { SemVer } from "../tools/SemVer";
+import { exclude } from "tsafe/exclude";
+import { getSupportedKeycloakMajorVersions } from "./realmConfig/defaultConfig";
+
+export type BuildContextLike = {
+    fetchOptions: BuildContext["fetchOptions"];
+};
+
+assert<BuildContext extends BuildContextLike ? true : false>;
+
+let cache: string[] | undefined = undefined;
+
+export async function getKeycloakDockerImageLatestSemVerTagsForEveryMajors(params: {
+    buildContext: BuildContextLike;
+}) {
+    if (cache !== undefined) {
+        return cache;
+    }
+
+    const { buildContext } = params;
+
+    const { tags } = await fetch(
+        "https://quay.io/v2/keycloak/keycloak/tags/list",
+        buildContext.fetchOptions
+    )
+        .then(r => r.json())
+        .then(j =>
+            z
+                .object({
+                    tags: z.array(z.string())
+                })
+                .parse(j)
+        );
+
+    const arr = tags
+        .map(tag => ({
+            tag,
+            version: (() => {
+                if (tag.includes("-")) {
+                    return undefined;
+                }
+
+                let version: SemVer;
+
+                try {
+                    version = SemVer.parse(tag);
+                } catch {
+                    return undefined;
+                }
+
+                return version;
+            })()
+        }))
+        .map(({ tag, version }) => (version === undefined ? undefined : { tag, version }))
+        .filter(exclude(undefined));
+
+    const versionByMajor: Record<number, SemVer | undefined> = {};
+
+    for (const { version } of arr) {
+        const version_current = versionByMajor[version.major];
+
+        if (
+            version_current === undefined ||
+            SemVer.compare(version_current, version) === -1
+        ) {
+            versionByMajor[version.major] = version;
+        }
+    }
+
+    const supportedKeycloakMajorVersions = getSupportedKeycloakMajorVersions();
+
+    cache = Object.values(versionByMajor)
+        .map(version => {
+            assert(version !== undefined);
+
+            if (!supportedKeycloakMajorVersions.includes(version.major)) {
+                return undefined;
+            }
+
+            return SemVer.stringify(version);
+        })
+        .filter(exclude(undefined));
+
+    return cache;
+}
diff --git a/src/bin/start-keycloak/realmConfig/ParsedRealmJson.ts b/src/bin/start-keycloak/realmConfig/ParsedRealmJson.ts
index ebb6354e..d92141c7 100644
--- a/src/bin/start-keycloak/realmConfig/ParsedRealmJson.ts
+++ b/src/bin/start-keycloak/realmConfig/ParsedRealmJson.ts
@@ -3,11 +3,14 @@ import { assert, type Equals } from "tsafe/assert";
 import { is } from "tsafe/is";
 import { id } from "tsafe/id";
 import * as fs from "fs";
-import { join as pathJoin } from "path";
-import { getThisCodebaseRootDirPath } from "../../tools/getThisCodebaseRootDirPath";
 
 export type ParsedRealmJson = {
     name: string;
+    loginTheme?: string;
+    accountTheme?: string;
+    adminTheme?: string;
+    emailTheme?: string;
+    eventsListeners: string[];
     users: {
         id: string;
         email: string;
@@ -52,6 +55,11 @@ export function readRealmJsonFile(params: {
 
         const zTargetType = z.object({
             name: z.string(),
+            loginTheme: z.string().optional(),
+            accountTheme: z.string().optional(),
+            adminTheme: z.string().optional(),
+            emailTheme: z.string().optional(),
+            eventsListeners: z.array(z.string()),
             users: z.array(
                 z.object({
                     id: z.string(),
@@ -105,19 +113,3 @@ export function readRealmJsonFile(params: {
 
     return parsedRealmJson;
 }
-
-export function getDefaultConfig(params: {
-    keycloakMajorVersionNumber: number;
-}): ParsedRealmJson {
-    const { keycloakMajorVersionNumber } = params;
-
-    const realmJsonFilePath = pathJoin(
-        getThisCodebaseRootDirPath(),
-        "src",
-        "bin",
-        "start-keycloak",
-        `myrealm-realm-${keycloakMajorVersionNumber}.json`
-    );
-
-    return readRealmJsonFile({ realmJsonFilePath });
-}
diff --git a/src/bin/start-keycloak/realmConfig/defaultConfig/defaultConfig.ts b/src/bin/start-keycloak/realmConfig/defaultConfig/defaultConfig.ts
new file mode 100644
index 00000000..220f4ac3
--- /dev/null
+++ b/src/bin/start-keycloak/realmConfig/defaultConfig/defaultConfig.ts
@@ -0,0 +1,74 @@
+import { join as pathJoin, dirname as pathDirname } from "path";
+import { getThisCodebaseRootDirPath } from "../../../tools/getThisCodebaseRootDirPath";
+import * as fs from "fs";
+import { exclude } from "tsafe/exclude";
+import { assert } from "tsafe/assert";
+import { type ParsedRealmJson, readRealmJsonFile } from "../ParsedRealmJson";
+
+export function getDefaultRealmJsonFilePath(params: {
+    keycloakMajorVersionNumber: number;
+}) {
+    const { keycloakMajorVersionNumber } = params;
+
+    return pathJoin(
+        getThisCodebaseRootDirPath(),
+        "src",
+        "bin",
+        "start-keycloak",
+        "realmConfig",
+        "defaultConfig",
+        `realm-kc-${keycloakMajorVersionNumber}.json`
+    );
+}
+
+export const { getSupportedKeycloakMajorVersions } = (() => {
+    let cache: number[] | undefined = undefined;
+
+    function getSupportedKeycloakMajorVersions(): number[] {
+        if (cache !== undefined) {
+            return cache;
+        }
+
+        cache = fs
+            .readdirSync(
+                pathDirname(
+                    getDefaultRealmJsonFilePath({ keycloakMajorVersionNumber: 0 })
+                )
+            )
+            .map(fileBasename => {
+                const match = fileBasename.match(/^realm-kc-(\d+)\.json$/);
+
+                if (match === null) {
+                    return undefined;
+                }
+
+                const n = parseInt(match[1]);
+
+                assert(!isNaN(n));
+
+                return n;
+            })
+            .filter(exclude(undefined));
+
+        return cache;
+    }
+
+    return { getSupportedKeycloakMajorVersions };
+})();
+
+export function getDefaultConfig(params: {
+    keycloakMajorVersionNumber: number;
+}): ParsedRealmJson {
+    const { keycloakMajorVersionNumber } = params;
+
+    assert(
+        getSupportedKeycloakMajorVersions().includes(keycloakMajorVersionNumber),
+        `We do not have a default config for Keycloak ${keycloakMajorVersionNumber}`
+    );
+
+    return readRealmJsonFile({
+        realmJsonFilePath: getDefaultRealmJsonFilePath({
+            keycloakMajorVersionNumber
+        })
+    });
+}
diff --git a/src/bin/start-keycloak/realmConfig/defaultConfig/index.ts b/src/bin/start-keycloak/realmConfig/defaultConfig/index.ts
new file mode 100644
index 00000000..a067247f
--- /dev/null
+++ b/src/bin/start-keycloak/realmConfig/defaultConfig/index.ts
@@ -0,0 +1 @@
+export * from "./defaultConfig";
diff --git a/src/bin/start-keycloak/realmConfig/realm-kc-18.json b/src/bin/start-keycloak/realmConfig/defaultConfig/realm-kc-18.json
similarity index 100%
rename from src/bin/start-keycloak/realmConfig/realm-kc-18.json
rename to src/bin/start-keycloak/realmConfig/defaultConfig/realm-kc-18.json
diff --git a/src/bin/start-keycloak/realmConfig/realm-kc-19.json b/src/bin/start-keycloak/realmConfig/defaultConfig/realm-kc-19.json
similarity index 100%
rename from src/bin/start-keycloak/realmConfig/realm-kc-19.json
rename to src/bin/start-keycloak/realmConfig/defaultConfig/realm-kc-19.json
diff --git a/src/bin/start-keycloak/realmConfig/realm-kc-20.json b/src/bin/start-keycloak/realmConfig/defaultConfig/realm-kc-20.json
similarity index 100%
rename from src/bin/start-keycloak/realmConfig/realm-kc-20.json
rename to src/bin/start-keycloak/realmConfig/defaultConfig/realm-kc-20.json
diff --git a/src/bin/start-keycloak/realmConfig/realm-kc-21.json b/src/bin/start-keycloak/realmConfig/defaultConfig/realm-kc-21.json
similarity index 100%
rename from src/bin/start-keycloak/realmConfig/realm-kc-21.json
rename to src/bin/start-keycloak/realmConfig/defaultConfig/realm-kc-21.json
diff --git a/src/bin/start-keycloak/realmConfig/realm-kc-23.json b/src/bin/start-keycloak/realmConfig/defaultConfig/realm-kc-23.json
similarity index 100%
rename from src/bin/start-keycloak/realmConfig/realm-kc-23.json
rename to src/bin/start-keycloak/realmConfig/defaultConfig/realm-kc-23.json
diff --git a/src/bin/start-keycloak/realmConfig/realm-kc-24.json b/src/bin/start-keycloak/realmConfig/defaultConfig/realm-kc-24.json
similarity index 100%
rename from src/bin/start-keycloak/realmConfig/realm-kc-24.json
rename to src/bin/start-keycloak/realmConfig/defaultConfig/realm-kc-24.json
diff --git a/src/bin/start-keycloak/realmConfig/realm-kc-25.json b/src/bin/start-keycloak/realmConfig/defaultConfig/realm-kc-25.json
similarity index 100%
rename from src/bin/start-keycloak/realmConfig/realm-kc-25.json
rename to src/bin/start-keycloak/realmConfig/defaultConfig/realm-kc-25.json
diff --git a/src/bin/start-keycloak/realmConfig/realm-kc-26.json b/src/bin/start-keycloak/realmConfig/defaultConfig/realm-kc-26.json
similarity index 100%
rename from src/bin/start-keycloak/realmConfig/realm-kc-26.json
rename to src/bin/start-keycloak/realmConfig/defaultConfig/realm-kc-26.json
diff --git a/src/bin/start-keycloak/realmConfig/dumpContainerConfig.ts b/src/bin/start-keycloak/realmConfig/dumpContainerConfig.ts
index b32d7879..81fb4443 100644
--- a/src/bin/start-keycloak/realmConfig/dumpContainerConfig.ts
+++ b/src/bin/start-keycloak/realmConfig/dumpContainerConfig.ts
@@ -1,4 +1,3 @@
-import { runPrettier, getIsPrettierAvailable } from "../../tools/runPrettier";
 import { CONTAINER_NAME } from "../../shared/constants";
 import child_process from "child_process";
 import { join as pathJoin } from "path";
@@ -6,7 +5,7 @@ import chalk from "chalk";
 import { Deferred } from "evt/tools/Deferred";
 import { assert, is } from "tsafe/assert";
 import type { BuildContext } from "../../shared/buildContext";
-import * as fs from "fs/promises";
+import { type ParsedRealmJson, readRealmJsonFile } from "./ParsedRealmJson";
 
 export type BuildContextLike = {
     cacheDirPath: string;
@@ -17,15 +16,9 @@ assert<BuildContext extends BuildContextLike ? true : false>();
 export async function dumpContainerConfig(params: {
     realmName: string;
     keycloakMajorVersionNumber: number;
-    targetRealmConfigJsonFilePath: string;
     buildContext: BuildContextLike;
-}) {
-    const {
-        realmName,
-        keycloakMajorVersionNumber,
-        targetRealmConfigJsonFilePath,
-        buildContext
-    } = params;
+}): Promise<ParsedRealmJson> {
+    const { realmName, keycloakMajorVersionNumber, buildContext } = params;
 
     {
         // https://github.com/keycloak/keycloak/issues/33800
@@ -148,20 +141,7 @@ export async function dumpContainerConfig(params: {
         await dCompleted.pr;
     }
 
-    let sourceCode = (await fs.readFile(targetRealmConfigJsonFilePath_tmp)).toString(
-        "utf8"
-    );
-
-    run_prettier: {
-        if (!(await getIsPrettierAvailable())) {
-            break run_prettier;
-        }
-
-        sourceCode = await runPrettier({
-            filePath: targetRealmConfigJsonFilePath,
-            sourceCode: sourceCode
-        });
-    }
-
-    await fs.writeFile(targetRealmConfigJsonFilePath, Buffer.from(sourceCode, "utf8"));
+    return readRealmJsonFile({
+        realmJsonFilePath: targetRealmConfigJsonFilePath_tmp
+    });
 }
diff --git a/src/bin/start-keycloak/realmConfig/index.ts b/src/bin/start-keycloak/realmConfig/index.ts
new file mode 100644
index 00000000..09a46a68
--- /dev/null
+++ b/src/bin/start-keycloak/realmConfig/index.ts
@@ -0,0 +1 @@
+export * from "./realmConfig";
diff --git a/src/bin/start-keycloak/realmConfig/prepareRealmConfig.ts b/src/bin/start-keycloak/realmConfig/prepareRealmConfig.ts
index 37bda1ad..afe79572 100644
--- a/src/bin/start-keycloak/realmConfig/prepareRealmConfig.ts
+++ b/src/bin/start-keycloak/realmConfig/prepareRealmConfig.ts
@@ -1,15 +1,26 @@
 import { assert } from "tsafe/assert";
-import { getDefaultConfig, type ParsedRealmJson } from "./ParsedRealmJson";
+import type { ParsedRealmJson } from "./ParsedRealmJson";
+import { getDefaultConfig } from "./defaultConfig";
+import type { BuildContext } from "../../shared/buildContext";
+import { objectKeys } from "tsafe/objectKeys";
+
+export type BuildContextLike = {
+    themeNames: BuildContext["themeNames"];
+    implementedThemeTypes: BuildContext["implementedThemeTypes"];
+};
+
+assert<BuildContext extends BuildContextLike ? true : false>;
 
 export function prepareRealmConfig(params: {
     parsedRealmJson: ParsedRealmJson;
     keycloakMajorVersionNumber: number;
+    buildContext: BuildContextLike;
 }): {
     realmName: string;
     clientName: string;
     username: string;
 } {
-    const { parsedRealmJson, keycloakMajorVersionNumber } = params;
+    const { parsedRealmJson, keycloakMajorVersionNumber, buildContext } = params;
 
     const { username } = addOrEditTestUser({
         parsedRealmJson,
@@ -23,6 +34,22 @@ export function prepareRealmConfig(params: {
 
     editAccountConsoleAndSecurityAdminConsole({ parsedRealmJson });
 
+    enableCustomThemes({
+        parsedRealmJson,
+        themeName: buildContext.themeNames[0],
+        implementedThemeTypes: buildContext.implementedThemeTypes
+    });
+
+    enable_custom_events_listeners: {
+        const name = "keycloakify-logging";
+
+        if (parsedRealmJson.eventsListeners.includes(name)) {
+            break enable_custom_events_listeners;
+        }
+
+        parsedRealmJson.eventsListeners.push(name);
+    }
+
     return {
         realmName: parsedRealmJson.name,
         clientName: clientId,
@@ -30,6 +57,21 @@ export function prepareRealmConfig(params: {
     };
 }
 
+function enableCustomThemes(params: {
+    parsedRealmJson: ParsedRealmJson;
+    themeName: string;
+    implementedThemeTypes: BuildContextLike["implementedThemeTypes"];
+}) {
+    const { parsedRealmJson, themeName, implementedThemeTypes } = params;
+
+    for (const themeType of objectKeys(implementedThemeTypes)) {
+        parsedRealmJson[`${themeType}Theme` as const] = implementedThemeTypes[themeType]
+            .isImplemented
+            ? themeName
+            : "";
+    }
+}
+
 function addOrEditTestUser(params: {
     parsedRealmJson: ParsedRealmJson;
     keycloakMajorVersionNumber: number;
diff --git a/src/bin/start-keycloak/realmConfig/realmConfig.ts b/src/bin/start-keycloak/realmConfig/realmConfig.ts
new file mode 100644
index 00000000..b7793ec7
--- /dev/null
+++ b/src/bin/start-keycloak/realmConfig/realmConfig.ts
@@ -0,0 +1,108 @@
+import type { BuildContext } from "../../shared/buildContext";
+import { assert } from "tsafe/assert";
+import { runPrettier, getIsPrettierAvailable } from "../../tools/runPrettier";
+import { getDefaultConfig } from "./defaultConfig";
+import {
+    prepareRealmConfig,
+    type BuildContextLike as BuildContextLike_prepareRealmConfig
+} from "./prepareRealmConfig";
+import * as fs from "fs";
+import { join as pathJoin, dirname as pathDirname } from "path";
+import { existsAsync } from "../../tools/fs.existsAsync";
+import { readRealmJsonFile, type ParsedRealmJson } from "./ParsedRealmJson";
+import {
+    dumpContainerConfig,
+    type BuildContextLike as BuildContextLike_dumpContainerConfig
+} from "./dumpContainerConfig";
+
+export type BuildContextLike = BuildContextLike_dumpContainerConfig &
+    BuildContextLike_prepareRealmConfig & {
+        projectDirPath: string;
+    };
+
+assert<BuildContext extends BuildContextLike ? true : false>;
+
+export async function getRealmConfig(params: {
+    keycloakMajorVersionNumber: number;
+    realmJsonFilePath_userProvided: string | undefined;
+    buildContext: BuildContextLike;
+}): Promise<{
+    realmJsonFilePath: string;
+    clientName: string;
+    realmName: string;
+    username: string;
+    onRealmConfigChange: () => Promise<void>;
+}> {
+    const { keycloakMajorVersionNumber, realmJsonFilePath_userProvided, buildContext } =
+        params;
+
+    const realmJsonFilePath = pathJoin(
+        buildContext.projectDirPath,
+        `realm-kc-${keycloakMajorVersionNumber}.json`
+    );
+
+    const parsedRealmJson = await (async () => {
+        if (realmJsonFilePath_userProvided !== undefined) {
+            return readRealmJsonFile({
+                realmJsonFilePath: realmJsonFilePath_userProvided
+            });
+        }
+
+        if (await existsAsync(realmJsonFilePath)) {
+            return readRealmJsonFile({
+                realmJsonFilePath
+            });
+        }
+
+        return getDefaultConfig({ keycloakMajorVersionNumber });
+    })();
+
+    const { clientName, realmName, username } = prepareRealmConfig({
+        parsedRealmJson,
+        buildContext,
+        keycloakMajorVersionNumber
+    });
+
+    {
+        const dirPath = pathDirname(realmJsonFilePath);
+
+        if (!(await existsAsync(dirPath))) {
+            fs.mkdirSync(dirPath, { recursive: true });
+        }
+    }
+
+    const writeRealmJsonFile = async (params: { parsedRealmJson: ParsedRealmJson }) => {
+        const { parsedRealmJson } = params;
+
+        let sourceCode = JSON.stringify(parsedRealmJson, null, 2);
+
+        if (await getIsPrettierAvailable()) {
+            sourceCode = await runPrettier({
+                sourceCode,
+                filePath: realmJsonFilePath
+            });
+        }
+
+        fs.writeFileSync(realmJsonFilePath, sourceCode);
+    };
+
+    await writeRealmJsonFile({ parsedRealmJson });
+
+    async function onRealmConfigChange() {
+        const parsedRealmJson = await dumpContainerConfig({
+            buildContext,
+            realmName,
+            keycloakMajorVersionNumber
+        });
+
+        await writeRealmJsonFile({ parsedRealmJson });
+    }
+
+    return {
+        realmJsonFilePath,
+        clientName,
+        realmName,
+        username,
+        onRealmConfigChange
+    };
+}
diff --git a/src/bin/start-keycloak/start-keycloak.ts b/src/bin/start-keycloak/start-keycloak.ts
index a70ba002..7d2adcad 100644
--- a/src/bin/start-keycloak/start-keycloak.ts
+++ b/src/bin/start-keycloak/start-keycloak.ts
@@ -1,6 +1,5 @@
 import type { BuildContext } from "../shared/buildContext";
 import { exclude } from "tsafe/exclude";
-import { promptKeycloakVersion } from "../shared/promptKeycloakVersion";
 import {
     CONTAINER_NAME,
     KEYCLOAKIFY_SPA_DEV_SERVER_PORT,
@@ -13,8 +12,7 @@ import {
     join as pathJoin,
     relative as pathRelative,
     sep as pathSep,
-    basename as pathBasename,
-    dirname as pathDirname
+    basename as pathBasename
 } from "path";
 import * as child_process from "child_process";
 import chalk from "chalk";
@@ -32,6 +30,9 @@ import { existsAsync } from "../tools/fs.existsAsync";
 import { rm } from "../tools/fs.rm";
 import { downloadAndExtractArchive } from "../tools/downloadAndExtractArchive";
 import { startViteDevServer } from "./startViteDevServer";
+import { getSupportedKeycloakMajorVersions } from "./realmConfig/defaultConfig";
+import { getKeycloakDockerImageLatestSemVerTagsForEveryMajors } from "./getQuayIoKeycloakDockerImageTags";
+import { getRealmConfig } from "./realmConfig";
 
 export async function command(params: {
     buildContext: BuildContext;
@@ -95,9 +96,32 @@ export async function command(params: {
 
     const { cliCommandOptions, buildContext } = params;
 
+    const availableTags = await getKeycloakDockerImageLatestSemVerTagsForEveryMajors({
+        buildContext
+    });
+
     const { dockerImageTag } = await (async () => {
         if (cliCommandOptions.keycloakVersion !== undefined) {
-            return { dockerImageTag: cliCommandOptions.keycloakVersion };
+            const cliCommandOptions_keycloakVersion = cliCommandOptions.keycloakVersion;
+
+            const tag = availableTags.find(tag =>
+                tag.startsWith(cliCommandOptions_keycloakVersion)
+            );
+
+            if (tag === undefined) {
+                console.log(
+                    chalk.red(
+                        [
+                            `We could not find a Keycloak Docker image for ${cliCommandOptions_keycloakVersion}`,
+                            `Example of valid values: --keycloak-version 26, --keycloak-version 26.0.7`
+                        ].join("\n")
+                    )
+                );
+
+                process.exit(1);
+            }
+
+            return { dockerImageTag: tag };
         }
 
         if (buildContext.startKeycloakOptions.dockerImage !== undefined) {
@@ -112,50 +136,81 @@ export async function command(params: {
                     "On which version of Keycloak do you want to test your theme?"
                 ),
                 chalk.gray(
-                    "You can also explicitly provide the version with `npx keycloakify start-keycloak --keycloak-version 25.0.2` (or any other version)"
+                    "You can also explicitly provide the version with `npx keycloakify start-keycloak --keycloak-version 26` (or any other version)"
                 )
             ].join("\n")
         );
 
-        const { keycloakVersion } = await promptKeycloakVersion({
-            startingFromMajor: 18,
-            excludeMajorVersions: [22],
-            doOmitPatch: true,
-            buildContext
+        const { value: tag } = await cliSelect<string>({
+            values: availableTags
+        }).catch(() => {
+            process.exit(-1);
         });
 
-        console.log(`→ ${keycloakVersion}`);
+        console.log(`→ ${tag}`);
 
-        return { dockerImageTag: keycloakVersion };
+        return { dockerImageTag: tag };
     })();
 
     const keycloakMajorVersionNumber = (() => {
-        if (buildContext.startKeycloakOptions.dockerImage === undefined) {
-            return SemVer.parse(dockerImageTag).major;
-        }
-
-        const { tag } = buildContext.startKeycloakOptions.dockerImage;
-
-        const [wrap] = [18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28]
+        const [wrap] = getSupportedKeycloakMajorVersions()
             .map(majorVersionNumber => ({
                 majorVersionNumber,
-                index: tag.indexOf(`${majorVersionNumber}`)
+                index: dockerImageTag.indexOf(`${majorVersionNumber}`)
             }))
             .filter(({ index }) => index !== -1)
             .sort((a, b) => a.index - b.index);
 
         if (wrap === undefined) {
-            console.warn(
-                chalk.yellow(
-                    `Could not determine the major Keycloak version number from the docker image tag ${tag}. Assuming 25`
-                )
-            );
-            return 25;
+            try {
+                const version = SemVer.parse(dockerImageTag);
+
+                console.error(
+                    chalk.yellow(
+                        `Keycloak version ${version.major} is not supported, supported versions are ${getSupportedKeycloakMajorVersions().join(", ")}`
+                    )
+                );
+
+                process.exit(1);
+            } catch {
+                console.warn(
+                    chalk.yellow(
+                        `Could not determine the major Keycloak version number from the docker image tag ${dockerImageTag}. Assuming 26`
+                    )
+                );
+                return 26;
+            }
         }
 
         return wrap.majorVersionNumber;
     })();
 
+    const { clientName, onRealmConfigChange, realmJsonFilePath, realmName, username } =
+        await getRealmConfig({
+            keycloakMajorVersionNumber,
+            realmJsonFilePath_userProvided: await (async () => {
+                if (cliCommandOptions.realmJsonFilePath !== undefined) {
+                    return getAbsoluteAndInOsFormatPath({
+                        pathIsh: cliCommandOptions.realmJsonFilePath,
+                        cwd: process.cwd()
+                    });
+                }
+
+                if (buildContext.startKeycloakOptions.realmJsonFilePath !== undefined) {
+                    assert(
+                        await existsAsync(
+                            buildContext.startKeycloakOptions.realmJsonFilePath
+                        ),
+                        `${pathRelative(process.cwd(), buildContext.startKeycloakOptions.realmJsonFilePath)} does not exist`
+                    );
+                    return buildContext.startKeycloakOptions.realmJsonFilePath;
+                }
+
+                return undefined;
+            })(),
+            buildContext
+        });
+
     {
         const { isAppBuildSuccess } = await appBuild({
             buildContext
@@ -193,156 +248,39 @@ export async function command(params: {
 
     assert(jarFilePath !== undefined);
 
-    const extensionJarFilePaths = await Promise.all(
-        buildContext.startKeycloakOptions.extensionJars.map(async extensionJar => {
-            switch (extensionJar.type) {
-                case "path": {
-                    assert(
-                        await existsAsync(extensionJar.path),
-                        `${extensionJar.path} does not exist`
-                    );
-                    return extensionJar.path;
+    const extensionJarFilePaths = [
+        pathJoin(
+            getThisCodebaseRootDirPath(),
+            "src",
+            "bin",
+            "start-keycloak",
+            KEYCLOAKIFY_LOGIN_JAR_BASENAME
+        ),
+        ...(await Promise.all(
+            buildContext.startKeycloakOptions.extensionJars.map(async extensionJar => {
+                switch (extensionJar.type) {
+                    case "path": {
+                        assert(
+                            await existsAsync(extensionJar.path),
+                            `${extensionJar.path} does not exist`
+                        );
+                        return extensionJar.path;
+                    }
+                    case "url": {
+                        const { archiveFilePath } = await downloadAndExtractArchive({
+                            cacheDirPath: buildContext.cacheDirPath,
+                            fetchOptions: buildContext.fetchOptions,
+                            url: extensionJar.url,
+                            uniqueIdOfOnArchiveFile: "no extraction",
+                            onArchiveFile: async () => {}
+                        });
+                        return archiveFilePath;
+                    }
                 }
-                case "url": {
-                    const { archiveFilePath } = await downloadAndExtractArchive({
-                        cacheDirPath: buildContext.cacheDirPath,
-                        fetchOptions: buildContext.fetchOptions,
-                        url: extensionJar.url,
-                        uniqueIdOfOnArchiveFile: "no extraction",
-                        onArchiveFile: async () => {}
-                    });
-                    return archiveFilePath;
-                }
-            }
-            assert<Equals<typeof extensionJar, never>>(false);
-        })
-    );
-
-    const thisDirPath = pathJoin(
-        getThisCodebaseRootDirPath(),
-        "src",
-        "bin",
-        "start-keycloak"
-    );
-
-    extensionJarFilePaths.unshift(pathJoin(thisDirPath, KEYCLOAKIFY_LOGIN_JAR_BASENAME));
-
-    const getRealmJsonFilePath_defaultForKeycloakMajor = (
-        keycloakMajorVersionNumber: number
-    ) => pathJoin(thisDirPath, `myrealm-realm-${keycloakMajorVersionNumber}.json`);
-
-    const realmJsonFilePath = await (async () => {
-        if (cliCommandOptions.realmJsonFilePath !== undefined) {
-            if (cliCommandOptions.realmJsonFilePath === "none") {
-                return undefined;
-            }
-            return getAbsoluteAndInOsFormatPath({
-                pathIsh: cliCommandOptions.realmJsonFilePath,
-                cwd: process.cwd()
-            });
-        }
-
-        if (buildContext.startKeycloakOptions.realmJsonFilePath !== undefined) {
-            assert(
-                await existsAsync(buildContext.startKeycloakOptions.realmJsonFilePath),
-                `${pathRelative(process.cwd(), buildContext.startKeycloakOptions.realmJsonFilePath)} does not exist`
-            );
-            return buildContext.startKeycloakOptions.realmJsonFilePath;
-        }
-
-        const internalFilePath = await (async () => {
-            const defaultFilePath = getRealmJsonFilePath_defaultForKeycloakMajor(
-                keycloakMajorVersionNumber
-            );
-
-            if (fs.existsSync(defaultFilePath)) {
-                return defaultFilePath;
-            }
-
-            console.log(
-                `${chalk.yellow(
-                    `Keycloakify do not have a realm configuration for Keycloak ${keycloakMajorVersionNumber} yet.`
-                )}`
-            );
-
-            console.log(chalk.cyan("Select what configuration to use:"));
-
-            const dirPath = pathDirname(defaultFilePath);
-
-            const { value } = await cliSelect<string>({
-                values: [
-                    ...fs
-                        .readdirSync(dirPath)
-                        .filter(fileBasename => fileBasename.endsWith(".json")),
-                    "none"
-                ]
-            }).catch(() => {
-                process.exit(-1);
-            });
-
-            if (value === "none") {
-                return undefined;
-            }
-
-            return pathJoin(dirPath, value);
-        })();
-
-        if (internalFilePath === undefined) {
-            return undefined;
-        }
-
-        const filePath = pathJoin(
-            buildContext.cacheDirPath,
-            pathBasename(internalFilePath)
-        );
-
-        fs.writeFileSync(
-            filePath,
-            Buffer.from(
-                fs
-                    .readFileSync(internalFilePath)
-                    .toString("utf8")
-                    .replace(/keycloakify\-starter/g, buildContext.themeNames[0])
-            ),
-            "utf8"
-        );
-
-        return filePath;
-    })();
-
-    add_test_user_if_missing: {
-        if (realmJsonFilePath === undefined) {
-            break add_test_user_if_missing;
-        }
-
-        const realm: Record<string, unknown> = JSON.parse(
-            fs.readFileSync(realmJsonFilePath).toString("utf8")
-        );
-
-        if (realm.users !== undefined) {
-            break add_test_user_if_missing;
-        }
-
-        const realmJsonFilePath_internal = (() => {
-            const filePath = getRealmJsonFilePath_defaultForKeycloakMajor(
-                keycloakMajorVersionNumber
-            );
-
-            if (!fs.existsSync(filePath)) {
-                return getRealmJsonFilePath_defaultForKeycloakMajor(25);
-            }
-
-            return filePath;
-        })();
-
-        const users = JSON.parse(
-            fs.readFileSync(realmJsonFilePath_internal).toString("utf8")
-        ).users;
-
-        realm.users = users;
-
-        fs.writeFileSync(realmJsonFilePath, JSON.stringify(realm, null, 2), "utf8");
-    }
+                assert<Equals<typeof extensionJar, never>>(false);
+            })
+        ))
+    ];
 
     async function extractThemeResourcesFromJar() {
         await extractArchive({
@@ -382,9 +320,7 @@ export async function command(params: {
         });
     } catch {}
 
-    const DEFAULT_PORT = 8080;
-    const port =
-        cliCommandOptions.port ?? buildContext.startKeycloakOptions.port ?? DEFAULT_PORT;
+    const port = cliCommandOptions.port ?? buildContext.startKeycloakOptions.port ?? 8080;
 
     const doStartDevServer = (() => {
         const hasSpaUi =
@@ -457,7 +393,7 @@ export async function command(params: {
         ...(realmJsonFilePath === undefined
             ? []
             : [
-                  `-v${SPACE_PLACEHOLDER}"${realmJsonFilePath}":/opt/keycloak/data/import/myrealm-realm.json`
+                  `-v${SPACE_PLACEHOLDER}"${realmJsonFilePath}":/opt/keycloak/data/import/${realmName}-realm.json`
               ]),
         `-v${SPACE_PLACEHOLDER}"${jarFilePath_cacheDir}":/opt/keycloak/providers/keycloak-theme.jar`,
         ...extensionJarFilePaths.map(
@@ -532,7 +468,14 @@ export async function command(params: {
         { shell: true }
     );
 
-    child.stdout.on("data", data => process.stdout.write(data));
+    child.stdout.on("data", async data => {
+        if (data.toString("utf8").includes("keycloakify-logging: REALM_CONFIG_CHANGED")) {
+            await onRealmConfigChange();
+            return;
+        }
+
+        process.stdout.write(data);
+    });
 
     child.stderr.on("data", data => process.stderr.write(data));
 
@@ -581,7 +524,7 @@ export async function command(params: {
                         (() => {
                             const url = new URL("https://my-theme.keycloakify.dev");
 
-                            if (port !== DEFAULT_PORT) {
+                            if (port !== 8080) {
                                 url.searchParams.set("port", `${port}`);
                             }
                             if (kcHttpRelativePath !== undefined) {
@@ -590,13 +533,20 @@ export async function command(params: {
                                     kcHttpRelativePath
                                 );
                             }
+                            if (realmName !== "myrealm") {
+                                url.searchParams.set("realm", realmName);
+                            }
+
+                            if (clientName !== "myclient") {
+                                url.searchParams.set("client", clientName);
+                            }
 
                             return url.href;
                         })()
                     )}`,
                     "",
                     "You can login with the following credentials:",
-                    `- username: ${chalk.cyan.bold("testuser")}`,
+                    `- username: ${chalk.cyan.bold(username)}`,
                     `- password: ${chalk.cyan.bold("password123")}`,
                     "",
                     `Watching for changes in ${chalk.bold(