Stuck in Configuration Utility restarting - Big IP

1. Log in to BIG-IP .

2. Make a backup using below command :

 /config/httpd/conf.d/proxy_ajp.conf cp /config/httpd/conf.d/proxy_ajp.conf /config/httpd/conf.d/proxy_ajp.conf.bk

3.Edit /config/httpd/conf.d/proxy_ajp.conf 

Below is the command to make the changes. After the command press "i"  (insert) to enable the editing and once the changes are done, enter esc and type :wq!(write and quite).

vi /config/httpd/conf.d/proxy_ajp.conf

Locate the following two "#ProxyPass" lines and  the below command .

#ProxyPass /tomcat/ ajp://localhost:8009/

#ProxyPass /examples/ ajp://localhost:8009/jsp-examples/

ProxyTimeout 10            #<----- Add this line

4.Save and close the file.

5.Restart httpd and tomcat.

bigstart restart httpd tomcat

F5 default credentials and some interesting Facts.

 Below are the default credentials for F5. you can change the credentials during initial setup wizard.

Cli

Username: root

Password: default

GUI

Username:admin

Password:admin

Interesting Fact:-

• Root and admin username cannot be deleted from F5.
• BY default,  username admin doesnot have access to the CLI but we can assign either advance shell or TMOS access to the "admin" user.

System >> Users : User List>> click user admin>> choose tmsh from drop down of "Terminal Access">> click update

• No GUI access can be given to user "root"

Global NTP servers

 NTP is a UDP based service which works on port number 123.It is recommended to use pool.ntp.org to find an NTP server.

All zones in All Pool Servers.

• Africa — africa.pool.ntp.org 
• Antarctica — antarctica.pool.ntp.org 
• Asia — asia.pool.ntp.org 
• Europe — europe.pool.ntp.org 
• North America — north-america.pool.ntp.org 
• Oceania — oceania.pool.ntp.org 
• South America — south-america.pool.ntp.org

Below is the command to check the ntp status on respective platforms.

A. Windows 

w32tm /query /peers

B. Ubuntu

/etc/ntp.conf

DNS root server list - A-M

 Below is the list of root servers starting from a to m.