問題描述：

centos7.5 修改默認ssh端口號,重啟sshd失敗如何解決

重啟sshd時 :

解決方案：

1.關閉setenforce

setenforce 0

設置永久關閉seLinux

vim /etc/sysconfig/seLinux

將第7行內容修改如下

SELINUX=disabled

# This file controls the state of SELinux on the system.  # SELINUX= can take one of these three values:  #     enforcing - SELinux security policy is enforced.  #     permissive - SELinux prints warnings instead of enforcing.  #     disabled - No SELinux policy is loaded.  SELINUX=disabled  # SELINUXTYPE= can take one of three two values:  #     targeted - Targeted processes are protected,  #     minimum - Modification of targeted policy. Only selected processes are protected.   #     mls - Multi Level Security protection.  SELINUXTYPE=targeted

2.啟動sshd服務

systemctl start sshd

3.查看sshd服務狀態

systemctl status sshd

4.防火墻開放sshd端口

firewall-cmd --zone=public --add-port=2023/tcp --permanent  firewall-cmd --reload  systemctl restart sshd