Linux modify hostname

If Linux wants to send mail using sendmail or Exim, etc., it is essential to configure the correct hostname.

Check if your hostname is correct. Check the host command as:

hostname -f

If the hostname is not a correct domain name, you need to modify it. Modify the host name is divided into 3 steps, for example, my host name should be set to ahuang.org:

1.hostname modify the host name

hostname ahuang.org

2. Modify the /etc/hosts file

vim /etc/hosts

The contents are as follows:

127.0.0.1 localhost.localdomain localhost

173.255.246.150( Actual IP) ahuang.org ahuang

3. Modify the HOSTNAME line in /etc/sysconfig/network. If it does not exist, add

vim /etc/sysconfig/network

Content is

HOSTNAME=ahuang.org

Now, test if Sendmail can send mail normally:

echo "Subject: test"