How to change the host name in linux

In linux, how does one modify the linux host name to take effect? Many people use the hostname to modify the host name. In fact, this is only for the moment. after restarting, it will be restored to the original name. many people say that to modify the/etc/hosts file, the host name in this file is only provided to d... in linux, how does one modify the linux host name to take effect? Many people use the hostname to modify the host name. In fact, this is only for the moment. after restarting, it will be restored to the original name. many people say that the host name in the/etc/hosts file is only provided for dns resolution. if you cannot use dns, you only need to modify the host name. in fact, it is to modify the host name in the file etc/sysconfig/network. NETWORKING = yes HOSTNAME = host name ------------------------------------------------------------------------ remember to restart !!! Complete hosts: Step 1: # hostname oratest Step 2: modify hostname in/etc/sysconfig/network Step 3: modify the/etc/hosts file note: Linux host names can include: uppercase/lowercase letters, numbers, and hyphens (-) Note: but it cannot contain underscores or begin with a number. For example, if the host name is incorrect for 51cloud or cloud_redhat64_vm. The host name should not be in this structure: the host name such as fenghao.cn is also faulty. A standard host name is the basis for your management system and server setup. If your host name is invalid, you may encounter an inexplicable error. for example, an application cannot connect or communicate with another host name based on the specification when running the program !!!