# localectl
System Locale: LANG=en_US.UTF-8
VC Keymap: us
X11 Layout: us# yum list langpacks-*:# localectl set-locale LANG=<language name># localectl set-locale LANG=zh_CN.utf8（补充：这里以将系统语言切换为中文为例）
# localectl
System Locale: LANG=zh_CN.utf8
VC Keymap: us
X11 Layout: usrpmdb BDB0113 Thread/process# rm -rf /var/lib/rpm/_db*# rpm --rebuilddb# yum clean all# yum repolist服务器系统配置好可用的软件源
# yum -y install cockpit cockpit-dashaboard（补充：cockpit 是管理单台主机的程序，cockpit-dashaboard 是管理多台主机的程序）
# systemctl enable --now cockpit.socket使用浏览器登录：https://<server IP address>:9090
# ssh-keygen -b 4096 -t rsa -C "<content>" -f "<public private key name>"（注意：在生成复杂 SSH 密钥的时候最好也设置它的使用密码）
# mv <public private key name>* ~/.ssh/# chmod -R 600 ~/.ssh/<public private key name>*# ssh-copy-id -i ~/.ssh/<public private key name>.pub <destination IP address># ssh -i ~/.ssh/<public private key name> <destination IP address>如果是 Rocky Linux & RHEL：
# vim /etc/ssh/sshd_conf将其中的：
......
# PasswordAuthentication yes
......修改为：
......
PasswordAuthentication no
......如果是 openSUSE & SLES：
# vim /etc/ssh/sshd_conf将其中的：
......
# PasswordAuthentication yes
......
# ChallengeResponseAuthentication yes
......修改为：
......
PasswordAuthentication no
......
ChallengeResponseAuthentication no
......# systemctl restart sshd# ssh-keygen -p -f ~/.ssh/<public private key name>（补充：无密码的 SSH 密钥也能通过此方法设置密码）
# ssh-keygen -l -f ~/.ssh/<public private key name>开启 core dump 之后，如果出现了 C 语言程序的 crash，则会将 crash 的结果记录到一个文件里
# ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 31722
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) 31722
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited# ulimit -c unlimited# ulimit -a
core file size (blocks, -c) unlimited
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 31722
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) 31722
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited# sysctl -w kernel.core_pattern=/tmp/corefile/core-%e-%p