自分がサーバを立てるときに最初にする設定（CentOS 7） ref: https://qiita.com/stmkza/items/f655d2815f495901bb2e

colorls.sh

alias ls='ls --color=auto -la' 2>/dev/null

file1.txt

sudo firewall-cmd --permanent --service=ssh --add-port=(ポート番号)/tcp
sudo firewall-cmd --permanent --service=ssh --remove-port=22/tcp

file2.txt

sudo yum -y update

file3.txt

sudo rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-7.rpm
sudo yum install -y https://centos7.iuscommunity.org/ius-release.rpm

file5.txt

sudo hostnamectl set-hostname (ホスト名)

profile

if [ $(id -u) -eq 0 ];
then
    export PS1="[\e[35m\u\e[37m@\e[32m\H\e[0m \W]# "
else
    export PS1="[\e[35m\u\e[37m@\e[32m\H\e[0m \W]$ "
fi

sshd_config

Port (ポート番号)
PermitRootLogin no
PubkeyAuthentication yes
PasswordAuthentication no