New Installation command yum to dnf # old yum install -y git # new dnf install -y git Hardware Information CentOS ハードウェア情報の取得 OS info cat /etc/redhat-release cat /etc/issue Configuration LoginProfile Change directory color on ssh cp /etc/DIR_COLORS ~/.dircolors vi ~/.dircolors DIR 01 ; 36 # directory LINK 36 ; 01 # symbolic link How to Add User to root Group on CentOS 5/CentOS 6 Change hostname hostnamectl set-hostname < HOSTNAME > SSHD CentOS7でSSHのポート番号を変更する firewalld Centos7 # Check enable firewall daemon systemctl is-enabled firewalld # Show status firewall daemon systemctl status firewalld # Stop firewall daemon systemctl stop firewalld # Start firewall daemon systemctl start firewalld # Disable firewall daemon systemctl disable firewalld # Enable firewall daemon systemctl enable firewalld Network Linuxのネットワークチーミング(Bonding)の設定【RHEL 6/CentOS 6】 Trouble shooting See easy Network status iftop Cannot connect internet ping <gateway IP> i