Changing IP Addresses

Owned by Paul McCullough (Unlicensed)
Last updated: Apr 17, 2012Version comment
2 min read

 

Personnel and Roles

The following roles may need to be present to help complete all activities.

  • DBA
  • linux system admin
  • application developer
  • nagios admin
  • network support
  • email admin

System Level Activities

The following activities may need to be completed to get things working.

iptables
sudo vi /etc/sysconfig/iptables
network

Make sure the network services are properly configured, setting the ip and gateway.

/sbin/ifconfig
sudo vi /etc/sysconfig/network-scripts/ifcfg-eth0
sudo /etc/init.d/network restart
nameserver

Make sure we are using the right nameservers...

sudo vi /etc/resolve.conf
ntp

After changing IPs I have found that system clocks will drift even though ntpd is running.
My solution has been to run the following commands...
where the IP for the ntpdate command is ntp server for the _your_ data center.

sudo /etc/init.d/ntpd stop
sudo /usr/sbin/ntpdate 10.1.3.22
sudo /etc/init.d/ntpd start

 

hosts
sudo vi /etc/hosts
email

The linux VMs send emails each day regarding their own general health and status.
Depending on where they are, an email admin may need to adjust the access settings that allow these emails to be sent.
See this file for guidance: https://sfgovdt.jira.com/svn/MAD/trunk/web/settings_env/live/environments.py
Here are the mail servers we us

 - ompmta01.sfgov.org
 - ironport.sfgov.org

Our email admins are Wayne Curtis or Marco Magellon.

Application Level Activities

The following activities may need to be completed to get the application running properly.

The application keeps addresses and credentials in several places.

DB

The DB configuration files and scripts can be found here

https://sfgovdt.jira.com/svn/DBA/eas/

and include the following

  • pg_hba.conf
  • pitr-replication.conf
  • rsync_backups.sh

Deploy these manually to master and slave.
Remember that you will need to manually ssh and accept the key.
Use this command:

$ ssh -p port_number ip_Address

 

WEB

The web tier has one configuration file...

https://sfgovdt.jira.com/svn/MAD/branches/1.1/web/settings_env/live/environments.py

Deploy environments.py by using the automated deploy processes.

$ cd /var/www/html
$ sudo ./deploy_eas_init.s
GEO

Geoserver has one configration file...

https://sfgovdt.jira.com/svn/MAD/branches/1.1/geoserver/configuration/live/environments.py

NOte this issue - http://code.google.com/p/eas/issues/detail?id=322

Deploy environments.py by using the automated deploy processes.

$ cd /usr/share/tomcat/webapps/
$ sudo ./deploy_geoserver.sh
NAGIOS

We will also need to update the nagios configurations.

ETL

The ETL connections are defined here:
https://sfgovdt.jira.com/svn/MAD/trunk/etl/src/config/live/config_connections.py

In some cases you may need to make changes the connection definitions.
In other cases you'll need to change the ssh configs of putty sessions.
If you do this, remember that you'll need to manually connect to accept the key.