CentOS cannot bootup after remove gnome
https://docs.bmc.com/docs/display/DISCO113/Booting+in+rescue+mode+on+CentOS+7
It stopped at “Started Update UTMP about System Runlevel Changes.”
Following the URL instruction and add this systemd.unit=multi-user.target
After login, change the default target using this command:
systemctl set-default multi-user.target
MariaDB Galera Cluster 筆記
原本 MySQL 加Cluster 的方法實在很麻煩，又要mysqldump又長downtime，仲要好難SET。今日無意中發現MariaDB Galera Cluster加入Cluster Node 係方便好多！
基本上跟住呢個教學做就OK
https://ahmermansoor.blogspot.com/2019/02/install-mariadb-galera-cluster-on-centos-7.html
( mysql_secure_installation 嗰一步唔使做 )
但有個卡關位係，因為本身個MariaDB 比較大，Cluster Node 開始Sync 嘅時候，多過1分30秒，systemd 當start fail！
解決方法係喺 /etc/systemd/system/mysqld.service, 喺 [Service] 下面加返 TimeoutStartSec = 60m
另外/etc/my.cnf 如果有啲特別設定，最好都複雜埋去啲 Cluster Node 。
仲有只支援 InnoDB，MyISAM 同步唔到新加的資料，要留意。