linux常见问题及解决方案

ssh

出现错误

例如： WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED！ Host key verification failed.

You can either edit that text file manually and remove the old key (you can see the line number in the error message), or use

ssh-keygen -R 34.124.248.193

firewalld

查看状态

sudo systemctl status firewalld

关闭

sudo systemctl stop firewalld

开启

sudo systemctl start firewalld

selinux

查看状态

getenforce

或

sestatus

临时关闭

跟永久关闭中selinux的值改成permissive效果一样

sudo setenforce 0

永久关闭

打开配置文件

sudo vim /etc/selinux/config

将selinux的值改为disabled或permissive

SELINUX=permissive

重启

SELinux配置将httpd网络连接关闭导致的502错误

可以临时将selinux关闭，也可以设置httpd网络连接

查看状态

getsebool httpd_can_network_connect

如果显示 httpd_can_network_connect --> off 则httpd网络连接关闭

开启httpd网络连接

sudo setsebool -P httpd_can_network_connect 1