Securing Linux SSH
~~~shell
$ sudo vi /etc/ssh/sshd_config
Dns command, primary DNS server in domain
To change DNS from command line: dnscmd
Fedora 24 breaks dhcp on network with mac rules
If dhcp server assign ip based on MAC, Fedora 24 client can’t get the right IP.
How to install ZFS on Fedora 24
~~~shell
$ sudo dnf install http://download.zfsonlinux.org/fedora/zfs-release$(rpm -E %dist).noarch.rpm
Customize DNS nameservers with DHCP setting by NetworkManger on CentOS 7
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
Change hostname on CentOS/Fedora
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firewall-cmd examples
~~~shell
systemctl status firewalld
MariaDB/MySql promote slave server to master server
Scenario: Master server had a problem and was gone. Promote slave 1 as a master server.
How to duplicate a database in mysql/mariadb
When backup database, don’t use option –databases. It will create use database command.
git tips
- set ssh-keys and git won’t ask password in future.