Remote Backup and SSH Login without Password

Created: 21.01.2015 | Updated: 19.02.2018

This is pretty useful if running remote backups within a cron job. The original posting can be found at GeekStuff:3 steps to perform SSH login without password

Step 1: Server Create public and private keys using ssh-key-gen on the server and adding this key to the authorized keys.

$ cd .ssh # if existing
ssh-keygen -t rsa # hit return through all prompts
cat id_rsa.pub >> authorized_keys
chmod 600 authorized_keys

Step 2(Linux): Client Copy the key to the client:

cd .ssh
scp myserver.com:.ssh/id_rsa myserver.rsa
chmod 600 myserver.rsa
echo "Host myserver" >> config
echo "Hostname example.com" >> config
echo "IdentityFile ~/.ssh/myserver.rsa" >> config

Step 2 (Apple): Client Copy the key to the client and add it to the key chain

scp myserver.com:.ssh/id_rsa myserver.rsa
ssh-add -K /<folder>/myserver.rsa

Step 3: Login to remote-host without entering the password

ssh <remote-host>

mysqldump without password

This is done by creating the file ~/.my.cnf in your user directory. The permissions need to be set to 600. Add this to your .my.cnf file

[mysqldump]
user=xxx
password=yyy

Some updates for later

https://www.liberiangeek.net/2014/11/change-openssh-port-centos-7/ https://www.unixmen.com/iptables-vs-firewalld/ https://wiki.centos.org/HowTos/Network/SecuringSSH