Using Hooks

Hooks in Essh are scripts executed before and after connecting remote servers.

Write the following code in your .esshconfig.lua.

host "web01.localhost" {
    HostName = "192.168.0.11",
    Port = "22",
    User = "kohkimakimoto",

    hooks_before_connect = {
        "echo before_connect: $HOSTNAME",
    },
    hooks_after_connect = {
        "echo after_connect: $HOSTNAME",
    },
    hooks_after_disconnect = {
        "echo after_disconnect: $HOSTNAME",
    },
}

Connect with the server.

$ essh web01.localhost 
before_connect: your-local-machine
after_connect: web01.localhost
[kohkimakimoto@web01.localhost ~]$ 

The hooks_before_connect and hooks_after_connect were executed. Disconnect with the server.

[kohkimakimoto@web01.localhost ~]$ exit
exit
Connection to 192.168.0.11 closed.
after_disconnect: your-local-machine

The hooks_after_disconnect was executed.

Essh supports below type of hooks:

• hooks_before_connect
• hooks_after_connect
• hooks_after_disconnect

Let’s read next section: Managing Hosts.