Catfee SSH Skill#

通过密码认证SSH连接远程服务器，执行运维操作。

前置要求#

已安装 Posh-SSH 模块（首次使用时自动安装）。

连接模板#

powershell

# 安装模块（如果未安装）
if (!(Get-Module -ListAvailable Posh-SSH)) {
    [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
    Install-PackageProvider -Name NuGet -MinimumVersion 2.8.5.201 -Force -Scope CurrentUser
    Install-Module -Name Posh-SSH -Force -Scope CurrentUser -AllowClobber
}
Import-Module Posh-SSH

# 创建凭证并连接（用户提供：IP、用户名、密码）
$cred = New-Object System.Management.Automation.PSCredential("$username", (ConvertTo-SecureString "$password" -AsPlainText -Force))
$session = New-SSHSession -ComputerName "$ip" -Credential $cred -AcceptKey

# 执行命令
Invoke-SSHCommand -SessionId $session.SessionId -Command "command"

# 关闭连接
Remove-SSHSession -SessionId $session.SessionId

常用操作#

查看系统信息#

powershell

Invoke-SSHCommand -SessionId $session.SessionId -Command "hostname && uname -a && cat /etc/os-release"

查看服务状态#

powershell

Invoke-SSHCommand -SessionId $session.SessionId -Command "systemctl status nginx"
Invoke-SSHCommand -SessionId $session.SessionId -Command "systemctl status docker"

查看文件#

powershell

Invoke-SSHCommand -SessionId $session.SessionId -Command "cat /path/to/file"
Invoke-SSHCommand -SessionId $session.SessionId -Command "ls -la /path/to/dir"

查看日志#

powershell

Invoke-SSHCommand -SessionId $session.SessionId -Command "tail -100 /var/log/nginx/error.log"
Invoke-SSHCommand -SessionId $session.SessionId -Command "journalctl -u nginx -n 100"

Nginx 诊断#

powershell

Invoke-SSHCommand -SessionId $session.SessionId -Command "nginx -t 2>&1"
Invoke-SSHCommand -SessionId $session.SessionId -Command "cat /etc/nginx/nginx.conf"
Invoke-SSHCommand -SessionId $session.SessionId -Command "ls -la /etc/nginx/conf.d/"
Invoke-SSHCommand -SessionId $session.SessionId -Command "cat /etc/nginx/conf.d/*.conf"

Docker 操作#

powershell

Invoke-SSHCommand -SessionId $session.SessionId -Command "docker ps -a"
Invoke-SSHCommand -SessionId $session.SessionId -Command "docker logs container_name --tail 100"
Invoke-SSHCommand -SessionId $session.SessionId -Command "docker-compose ps"

进程和端口#

powershell

Invoke-SSHCommand -SessionId $session.SessionId -Command "ps aux | grep nginx"
Invoke-SSHCommand -SessionId $session.SessionId -Command "netstat -tlnp"
Invoke-SSHCommand -SessionId $session.SessionId -Command "ss -tlnp"

输出格式化#

获取完整命令输出：

powershell

Invoke-SSHCommand -SessionId $session.SessionId -Command "command" | Select-Object -ExpandProperty Output | Out-String -Width 4000

会话保持#

连续执行多个命令时保持同一个 session：

powershell

$session = New-SSHSession -ComputerName "$ip" -Credential $cred -AcceptKey
Invoke-SSHCommand -SessionId $session.SessionId -Command "cmd1"
Invoke-SSHCommand -SessionId $session.SessionId -Command "cmd2"
Invoke-SSHCommand -SessionId $session.SessionId -Command "cmd3"
Remove-SSHSession -SessionId $session.SessionId

执行修改操作#

执行需要sudo权限的操作：

powershell

Invoke-SSHCommand -SessionId $session.SessionId -Command "sudo nginx -s reload"
Invoke-SSHCommand -SessionId $session.SessionId -Command "sudo systemctl restart docker"

安全注意#

• 每次使用用户提供的具体凭证，不存储凭证
• 完成操作后关闭SSH会话
• 不在日志或输出中暴露敏感信息