Merge pull request #49 from deynekoaa/master

Add install instruction for CentOS 7 ELS

docs/extended-lifecycle-support/README.md

@@ -76,6 +76,7 @@ repo.cloudlinux.com
 ```
 cln.cloudlinux.com
 repo.tuxcare.com
+els-rollout.tuxcare.com
 ```
 
 ### Technical Support
@@ -190,6 +191,51 @@ License     : GPLv2
 Description : CentOS Server simulate els release files
 ```
 
+### CentOS 7 ELS
+
+1. Download an installer script:
+
+```
+wget https://repo.tuxcare.com/centos7-els/install-centos7-els-repo.sh
+```
+
+2. Run the installer script with keys:
+
+```
+sh install-centos7-els-repo.sh --license-key XXXX-XXXXXXXXX
+```
+
+The installation script registers a server in CLN with the key and adds a PGP key to the server.
+
+3. Verify that the installation was successful.
+
+To ensure the installation has been completed successfully, run the following command:
+
+```
+yum info els-define
+```
+
+It should return the info about an available package. If you can see information about the package, you can be sure that the installation was successful. After this, you will be able to install updates from the repository using a regular yum upgrade command.
+
+Example:
+
+```
+[els@centos7 ~]# yum info els-define
+Loaded plugins: fastestmirror
+Loading mirror speeds from cached hostfile
+Installed Packages
+Name        : els-define
+Arch        : x86_64
+Version     : 1
+Release     : 1.0.4.el7
+Size        : 52
+Repo        : installed
+From repo   : centos7-els
+Summary     : CentOS Server els-release file
+License     : GPLv2
+Description : CentOS Server els-release file
+```
+
 ### CentOS 8 ELS
 
 1. Download an installer script: