The easiest way to install Salt (both master and minions)

Prevent OpenVPN Access Server from opening up inbound firewall rules to all web admin ports

Salt minions lose connection with salt master after restarting iptables

So you want to manage iptables firewall rules with Salt. If you write up a state file that looks like the below, it will work as expected… sorta. It seems existing connections will be dropped and subsequent commands from the Salt master will not make it to the minion, e.g. your separate SSH session will lose connectivity to the minion:

iptables:

pkg.installed

/etc/sysconfig/iptables:

file.managed:

– source: salt://eocprdev/files/iptables

– user: root

– group: root

– mode: 600

restart-iptables-service:

cmd.wait:

– name: service iptables restart

– watch:

– file: /etc/sysconfig/iptables

if you’re logged in to the minion and do a “service iptables restart”, it seems things are fine, so the above command in the “name:” section seems like it’d be fine.

Here’s how you need to do it though. Note the “iptables-restore” method of reloading the iptables rules:

iptables:

pkg.installed

/etc/sysconfig/iptables:

file.managed:

– source: salt://eocprdev/files/iptables

– user: root

– group: root

– mode: 600

restart-iptables-service:

cmd.wait:

– name: iptables-restore < /etc/sysconfig/iptables

– watch:

– file: /etc/sysconfig/iptables

This second way works repeatedly, and existing connections to the minion remain intact.

Here’s a mention of someone else having the problem: http://ift.tt/1j5DemF

Installing Icinga

SQL Server Log Shipping – Fail over to the secondary then later fail over back to the primary

CPU Ready Time in VMWare ESXi

Some quick ways to find out how much of or VM’s time is spent waiting for ESXi to schedule CPU time:

As a shortcut, you can use the following formulas for the default chart update intervals to get the CPU ready %:

Realtime: CPU summation value / 200

Past Day: CPU summation value / 3000

Past Week: CPU summation value / 18000

Past Month: CPU summation value / 72000

Past Year: CPU summation value / 864000

Example: A realtime CPU summation value of 1000 is divided by 200 to give a CPU ready % of 5.

CPU ready summation value

As with the longer version of the formula, reverse the formula and multiply (rather tha dividing) to calculate the CPU ready summation value:

Realtime: CPU ready % * 200

Past Day: CPU ready % * 3000

Past Week: CPU ready % * 18000

Past Month: CPU ready % * 72000

Past Year: CPU ready % * 864000

Example: If you have a CPU ready % 5, multiply it by 200 to get a Realtime CPU ready summation value of 1000.

Above taken from here:

http://ift.tt/1gW6aaX

A good blog post on the topic of Ready Time:

http://ift.tt/UTe7Wq