Start up as CentOS7 systemd service

1. create service file

       # vi /usr/lib/systemd/system/myproxy.service
       [Unit]
       Description=SSH tunnel to proxy server
       Wants=network-online.target
       After=network-online.target
   
       [Service]
       Type=forking
       ExecStart=/usr/bin/ssh -NfD 1080 -i /root/.ssh/id_rsa johnson@jserver
   
       [Install]
       WantedBy=multi-user.target
       

2. config ssh client keepalive

       # vi /etc/ssh/ssh_config
       Host *
           # the keepalive msg to send before disconnected
           ServerAliveCountMax 2
           # in seconds
           ServerAliveInterval 60
       

3. enable service

       systemctl enable myproxy.service
       

4. start service

       systemctl start myproxy.service