SSH session persistence tips: long-term remote management in Linux SysOps

SSH session retention skills: To achieve long-term remote management in Linux SysOps, specific code examples are required

Abstract: In Linux system operation and maintenance work, remote management is An essential skill. This article introduces SSH session persistence techniques to help SysOps improve efficiency and stability in long-term remote management. Through specific code examples, we will show how to implement SSH session persistence to ensure smooth remote management.

1. Introduction
   In modern Linux SysOps work, remote management has become an indispensable skill. Remote management not only improves work efficiency, but also saves a lot of manpower and material resources. SSH (Secure Shell) is widely used as a secure remote management tool. However, during long-term remote management, SSH sessions are often interrupted due to unstable network connections or other reasons, which brings a lot of inconvenience to SysOps work. To solve this problem, this article will introduce several SSH session persistence techniques and provide specific code examples.
2. SSH session persistence tips
   2.1 Use tmux or screen
   Tmux and screen are two popular terminal multiplexing tools. They can create multiple virtual terminals in a terminal session and can Keep the session running after disconnecting from SSH. The following is a code example using tmux:

# 安装tmux
sudo apt-get install tmux

# 启动tmux会话
tmux

# 在tmux会话中运行你的命令或程序

# 断开SSH连接

# 重新连接SSH
tmux attach

2.2 Using the ClientAliveInterval and ClientAliveCountMax options
There are two options in the SSH server configuration file (/etc/ssh/sshd_config) that can be used to maintain SSH The session is active, they are ClientAliveInterval and ClientAliveCountMax respectively. ClientAliveInterval defines the time interval for the server to send keep-alive messages to the client, in seconds; ClientAliveCountMax defines the number of times the server sends keep-alive messages to the client. After the number of times is exceeded, the connection will be disconnected. Here is an example configuration:

ClientAliveInterval 60
ClientAliveCountMax 3

2.3 Using autossh
autossh is a tool for monitoring and automatically reconnecting SSH sessions. It automatically reconnects after the SSH connection is interrupted and keeps the session active. The following is a code example using autossh:

# 安装autossh
sudo apt-get install autossh

# 启动autossh会话
autossh -M 0 -o "ServerAliveInterval 30" -o "ServerAliveCountMax 3" -L 8080:localhost:80 user@remotehost

3. Summary
   SSH session persistence is a skill that must be mastered in Linux SysOps. By using tmux or screen, configuring the ClientAliveInterval and ClientAliveCountMax options, and using the autossh tool, SysOps can achieve long-term stable operation of remote management. This article introduces specific code examples of these techniques, hoping to be helpful to readers in remote management work. At the same time, we also recommend readers to read relevant documents and reference materials to learn more about the details and techniques of SSH session persistence.

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