How to set automatic service startup in CentOS

In other CentOS or RedHat systems, if services are installed later, such as httpd, mysqld, and postfix, the system will not start automatically after installation. Even if you manually run/etc/init. d/mysqldstart to start the service, the system will not start the service automatically after the server is restarted. At this time, we need to set up after installation so that the system can automatically start these services to avoid unnecessary losses and troubles. In fact, the command is very simple.

In other CentOS or RedHat systems, if services are installed later, such as httpd, mysqld, and postfix, the system will not start automatically after installation. Even if you manually run/etc/init. d/mysqld start to start the service, the system will not start the service automatically after the server is restarted.

At this time, we need to set up after installation so that the system can automatically start these services to avoid unnecessary losses and troubles.

In fact, the command is very simple.ChkconfigYou can. For example, you need to set mysqld to automatically start upon startup:

# Chkconfig mysqld on

Similarly, to cancel automatic startup of a service, you only need to change the "on" parameter to "Off. For example, to cancel automatic start of postfix:

# Chkconfig postfix off

It is worth noting that if this service has not been added to the chkconfig list, you need to add it using the-add parameter:

# Chkconfig-add postfix

To query all the automatically started Services, enter:

# Chkconfig-list

However, this shows that there are too many things and it looks dizzy. What if I only want to view the specified service? In this case, you only need to add the service name after "-list". for example, to check whether the httpd service is automatically started, enter:

# Chkconfig-list httpd

Output result at this time:

Httpd 0: off 1: off 2: off 3: off 4: off 5: off 6: off

At this time, 0 ~ If both are off, the httpd service will not be automatically started when the system starts. After entering chkconfig httpd on, we will check again that the output result is:

Httpd 0: off 1: off 2: on 3: on 4: on 5: on 6: off

2 ~ If all five are on, it indicates that it will be automatically started.