docs: match SSH installation commands to container distributions

docs/zh/docs/en/zestu/instance/ssh.md

@@ -5,29 +5,28 @@ Using SSH, users can securely access container instances on the platform from th
 
 ## Log in to a Container Instance Using SSH Username/Password
 
-1. In the container’s terminal, install the `openssh-server` service.
+1. In the container instance's terminal, check whether the SSH server is installed.
 
-    If it's already installed, you may skip this step and proceed to Step 2.
-
-    - Run the following command to install the SSH server:
-
-        ```bash
-        apt-get update && apt install openssh-server
-        ```
-
-    - Verify the installation:
+    ```bash
+    command -v sshd
+    ```
 
-        - Check for SSH processes:
+    If this returns the path to `sshd`, skip the installation.
+    Otherwise, run `cat /etc/os-release` to identify the container image's Linux distribution, then run the matching installation command as root.
 
-            ```bash
-            ps -e | grep ssh
-            ```
+    | Linux distribution | Installation command |
+    | --- | --- |
+    | Debian / Ubuntu | `apt-get update && apt-get install -y openssh-server` |
+    | Fedora / Rocky Linux / AlmaLinux | `dnf install -y openssh-server` |
+    | CentOS / RHEL images using yum | `yum install -y openssh-server` |
+    | Alpine Linux | `apk add --no-cache openssh-server` |
 
-        - Check installed packages:
+    After installation, run `command -v sshd` again to confirm that the server executable is available.
+    Installing only `openssh-client` or finding `ssh` in a package list does not confirm that the SSH server is installed.
 
-            ```bash
-            dpkg -l | grep ssh
-            ```
+    Before logging in, also ensure that the SSH server is running, using the image's startup mechanism.
+    Installing the package does not mean the service has started, and container images do not necessarily use systemd.
+    See [Service Auto-start](service-auto-start.md) to configure services in a container instance.
 
 2. After the container starts, click the **SSH Login** button in the container instance list to open a dialog with login information.
 

docs/zh/docs/zestu/instance/ssh.md

@@ -4,29 +4,28 @@ SSH（Secure Shell）是一种网络协议，用于在不安全的网络中安
 
 ## 使用 SSH 用户名/密码登录容器实例
 
-1. 在打开的 Terminal 终端中，安装 openssh-server 服务。
+1. 在容器实例内部的 Terminal 终端中，检查是否已安装 SSH 服务端。
 
-    若已安装可跳过此步骤，直接进入步骤二。
-
-    1. 执行如下命令，安装 openssh-server 服务。
-
-        ```shell
-        apt-get update && apt install openssh-server
-        ```
-
-    1. 检查安装是否成功。
+    ```shell
+    command -v sshd
+    ```
 
-        * 检查 ssh 进程。
+    如果返回 `sshd` 的路径，说明已安装，可跳过安装步骤。
+    否则，先运行 `cat /etc/os-release` 查看容器镜像的 Linux 发行版，再以 root 用户运行对应的安装命令。
 
-            ```shell
-            ps -e | grep ssh
-            ```
+    | Linux 发行版 | 安装命令 |
+    | --- | --- |
+    | Debian / Ubuntu | `apt-get update && apt-get install -y openssh-server` |
+    | Fedora / Rocky Linux / AlmaLinux | `dnf install -y openssh-server` |
+    | 使用 yum 的 CentOS / RHEL 镜像 | `yum install -y openssh-server` |
+    | Alpine Linux | `apk add --no-cache openssh-server` |
 
-        * 检查安装包。
+    安装后，再次运行 `command -v sshd` 确认服务端程序可用。
+    仅安装 `openssh-client` 或在包列表中找到 `ssh`，不能证明已安装 SSH 服务端。
 
-            ```
-            dpkg -l | grep ssh
-            ```
+    登录前还需确保 SSH 服务端已使用镜像的启动方式启动。
+    安装软件包不代表服务已启动，容器镜像也不一定使用 systemd。
+    参阅[服务开机自启动](service-auto-start.md)配置容器实例中的服务。
 
 2. 容器启动后，在容器实例列表中点击 SSH 登录按钮，打开弹窗复制 SSH 的登录信息。