By default, Network Manager always changes the resolv.conf file if the interface is using DHCP. The NetworkManger puts the records from DHCP server on top and the customize DNS servers at bottom. It causes private DNS setting cannot be found. To fix it, just change the PEERDNS=no in /etc/sysconfig/network-scripts/ifcfg-eth0 and restart network
systemctl status firewalld
Scenario: Master server had a problem and was gone. Promote slave 1 as a master server.
When backup database, don’t use option –databases. It will create use database command.
- set ssh-keys and git won’t ask password in future.
- Add docker yum repository
Master node: db01
- change origin data folder as mount point
WARN: ZFS module does NOT with new kernel. File system xfs is better. Using lvm is a good option.
- Install epel-release and setup zfs repository.