= Running operating system updates =

Support team members [wiki:support-team/all-servers-root-access with root access on all servers] can help with running operating system updates (`apt-get update && apt-get dist-upgrade`).

Using freepuppet, there are two ways to do this:

 * Upgrade one or more servers serially:
{{{
freepuppet-helper au:viewsic
freepuppet-helper au:mosh
}}}
 * Upgrade multiple servers simultaneously:
  * Ensure you have cluster ssh installed:
{{{
apt-get install clusterssh
}}}
  * Use freepuppet helper. The following example will open a series of 12 simultaneous ssh connections to mosh servers. There will be one window to type a command that will be executed on all servers at the same time. Type: `apt-get update` followed by `apt-get dist-upgrade`. Once it is complete on all servers, type: `exit`. Once all connections are closed, it will open the next 12 until all mosh servers have been opened. 
{{{
freepuppet-helper ce:mosh
}}}

Whenever possible, run updates after 10:00 pm America/New_York during the working week or anytime on the weekend.