Step-by-Step Guide to Configuring Lsyncd with Public Key Authentication

admin — Mon, 26 Aug 2024 08:40:12 +0000

1. Install Lsyncd

First, install Lsyncd on the main server where you want to set up synchronization.

For Debian/Ubuntu-based systems:

sudo apt-get update

sudo apt-get install lsyncd

For Red Hat/CentOS-based systems:

sudo yum install epel-release

sudo yum install lsyncd

2. Generate SSH Public Key

Generate an SSH key pair (public and private keys) on the main server (Server A).

ssh-keygen -t rsa -b 4096

Follow the prompts and save the keys in the default directory (~/.ssh/id_rsa for the private key and ~/.ssh/id_rsa.pub for the public key).

3. Copy the Public Key to the Remote Server

Copy the generated public key to the destination server (Server B) using the following command:

ssh-copy-id user@remote_server

This command will add the public key to the ~/.ssh/authorized_keys file on the remote server, allowing passwordless authentication.

4. Verify SSH Passwordless Connection

Verify that you can connect to the remote server without needing to enter a password:

ssh user@remote_server

If the connection succeeds without asking for a password, the public key setup is working correctly.

5. Configure the Lsyncd File

Edit or create the Lsyncd configuration file, usually located at /etc/lsyncd/lsyncd.conf.lua.

Configuration example:

settings {
logfile = “/var/log/lsyncd/lsyncd.log”,
statusFile = “/var/log/lsyncd/lsyncd-status.log”,
nodaemon = false,
}

sync {
default.rsyncssh,
source = “/ruta/a/sincronizar/”,
host = “usuario@servidor_remoto”,
targetdir = “/ruta/remota/destino/”,
rsyncOpts = {“-avz”},
ssh = {
port = 22,
identityFile = “/home/tu_usuario/.ssh/id_rsa”
}
}

6. Start Lsyncd

Start Lsyncd to begin synchronization:

sudo lsyncd /etc/lsyncd/lsyncd.conf.lua

To ensure Lsyncd starts automatically when the server boots, you can enable it as a system service.

7. Monitoring and Logs

Check Lsyncd logs to monitor its activity and ensure synchronization is occurring correctly:

tail -f /var/log/lsyncd/lsyncd.log

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