问题描述：

centos7.5 修改默认ssh端口号,重启sshd失败如何解决

重启sshd时 :

解决方案：

1.关闭setenforce

setenforce 0

设置永久关闭seLinux

vim /etc/sysconfig/seLinux

将第7行内容修改如下

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.启动sshd服务

systemctl start sshd

3.查看sshd服务状态

systemctl status sshd

4.防火墙开放sshd端口

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