Merge pull request #9197 from ninjadq/update_migration_doc_for_1.9

Update the doc of migration

docs/migration_guide.md

@@ -17,55 +17,71 @@ Since the migration might alter the database schema and the settings of `harbor.
 ## Upgrading Harbor and Migrating Data
 
 1. Log in to the host that Harbor runs on, stop and remove existing Harbor instance if it is still running:
-    ```
+
+    ```sh
     cd harbor
     docker-compose down
     ```
 
 2. Back up Harbor's current files so that you can roll back to the current version if necessary.
-    ```
+
+    ```sh
     mv harbor /my_backup_dir/harbor
     ```
+
     Back up database (by default in directory `/data/database`)
-    ```
+
+    ```sh
     cp -r /data/database /my_backup_dir/
     ```
 
 3. Get the latest Harbor release package from Github:
-   https://github.com/goharbor/harbor/releases
+   [https://github.com/goharbor/harbor/releases](https://github.com/goharbor/harbor/releases)
 
 4. Before upgrading Harbor, perform a migration first. The migration tool is delivered as a docker image, so you should pull the image from docker hub. Replace [tag] with the release version of Harbor (for example, v1.9.0) in the command below:
-    ```
+
+    ```sh
     docker pull goharbor/harbor-migrator:[tag]
     ```
 
-5. If you are upgrading from v1.7.x, migrate from `harbor.cfg` to `harbor.yml`.
+5. If you are current version is v1.7.x or earlier, i.e. migrate config file from `harbor.cfg` to `harbor.yml`.
+
     **NOTE:** You can find the ${harbor_yml} in the extracted installer you got in step `3`, after the migration the file `harbor.yml`
     in that path will be updated with the values from ${harbor_cfg}
 
-    ```
+    ```sh
     docker run -it --rm -v ${harbor_cfg}:/harbor-migration/harbor-cfg/harbor.yml -v ${harbor_yml}:/harbor-migration/harbor-cfg-out/harbor.yml goharbor/harbor-migrator:[tag] --cfg up
     ```
+
+    Otherwise, If your version is 1.8.x or higher, just upgrade the `harbor.yml` file.
+
+    ```sh
+    docker run -it --rm -v ${harbor_yml}:/harbor-migration/harbor-cfg/harbor.yml goharbor/harbor-migrator:[tag] --cfg up
+    ```
+
     **NOTE:** The schema upgrade and data migration of the database is performed by core when Harbor starts, if the migration fails, please check the log of core to debug.
 
 6. Under the directory `./harbor`, run the `./install.sh` script to install the new Harbor instance. If you choose to install Harbor with components such as Notary, Clair, and chartmuseum, refer to [Installation & Configuration Guide](../docs/installation_guide.md) for more information.
 
-
 ## Roll Back from an Upgrade
+
 If, for any reason, you want to roll back to the previous version of Harbor, perform the following steps:
 
 1. Stop and remove the current Harbor service if it is still running.
-    ```
+
+    ```sh
     cd harbor
     docker-compose down
     ```
 
 2. Remove current Harbor instance.
-    ```
+
+    ```sh
     rm -rf harbor
     ```
 
 3. Restore the older version package of Harbor.
+
     ```sh
     mv /my_backup_dir/harbor harbor
     ```
@@ -74,8 +90,10 @@ If, for any reason, you want to roll back to the previous version of Harbor, per
 
 5. Restart Harbor service using the previous configuration.  
    If previous version of Harbor was installed by a release build:
+
     ```sh
     cd harbor
     ./install.sh
     ```
+
 **NOTE**: While you can roll back an upgrade to the state before you started the upgrade, Harbor does not support downgrades.