- 时间同步服务：
systemctl start chronyd && systemctl start chronyd
- 查看nfs共享目录：
showmount -e masrer
- 免密登录：
ssh-keygen -t rsa
ssh-copy-id root@cn1
ssh cn1
- chmod权限r(4)w(2)x(1)/chown/chgrp：
chmod - modify file access rights
chmod u=rwx,g+w,o+x 123.txt
给123.txt文件的属主增加rwx,属组增加x，其他用户增加x权限
https://blog.51cto.com/u_12772149/2599810
chown - change file ownership
chgrp - change a file’s group ownership
- Change a USER and GROUP ID on Linux For All Owned Files：
To assign a new UID to user called slurm, enter:# usermod -u 202 slurm
To assign a new GID to group called slurm, enter:# groupmod -g 202 slurm
https://www.cyberciti.biz/faq/linux-change-user-group-uid-gid-for-all-owned-files/
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