CentOS – Job for network.service failed

prob2

Ugh. Ok, so something I came across today that I figured might help someone else out in the future. I’m setting up a new CentOS 7 box and while I was doing that I kept having intermittent network connectivity issues.  For some reason I decided NetworkManager needed to get out of my way… so I went about the process of disabling all that nonsense and went back to doing network config the way I know how. I set a reservation in DHCP (temporary), and set ifcfg-eth0 as a static IP along with all the other relevant pieces to get the interface manually configured.

Problem was I couldn’t get the network to come up. Here was my first issue:
prob1

Naturally I follow directions and ran “systemctl status network.service -l” and was greeted with:

prob2

Relevant bits highlighted. Now I’m pretty sure nothing is using that address since I got it from DHCP … so a bit of Googling led me to this link. The explanation here is that when ifup-eth runs it does an arping to determine if anything is using that address, and if anything replies then it exists the script. The offending section is this: Continue reading

Been a while. ..


Realized (when I actually looked at the notifications) that I had not posted here in ages and that the domain had expired so this site wasn’t even available anymore. I guess some times you get so busy you forget to post.

I’ll work on fixing that.

 

Monitoring Windows DHCP Scopes with Nagios


Nagios_logo_blackOn your DHCP Server

You need this VB Script in the scripts directory of NSClient++ on the DHCP Server:
check_dhcp_scope.vbs

Change the .doc extension to .vbs or hit the link to Nagios exchange below for the original file.

Now in nsc.ini — Enable NRPEListener.dll and CheckExternalScripts.dll
Also in nsc.ini add the following in the External Scripts Section:

check_dhcp_scope=cscript.exe //T:30 //NoLogo scripts\check_dhcp_scope.vbs

Restart the NSClient++ on the DHCP server.
Continue reading

Configure Domain Controller Time Syncronization with External Source


Clock

The PDC Emulator in your domain is the only system you should need to run this on. The rest of the systems should sync with this DC. I’ve included the commands below that you can run against your secondary DCs just to make sure they know what they should be doing. This is a rare thing to have to do … but I ended up having to do it today because the time source configured on our domain (long ago) stopped serving up time. WARNING: To much time skew between your current time and the updated time could cause serious headaches for your clients. WARNING!

On your PDC Emulator from an elevated command prompt:

Continue reading

Upgrade Steps Outline – DPM 2010 to 2012 SP1


System Center

What follows is the basic outline I followed to upgrade System Data Protection Manager 2010 – DPM – running on a Windows Server 2008 R2 host to DPM 2012 SP1. Obviously each step has small libraries of documentation you could read, warnings you could ignore, and whatnot – but if you’re simply looking to make sure you’ve got the right steps planned out, this is what I did to upgrade our setup:

Please note – I did this same set of steps across both of our systems (primary site and secondary site).

  1. Ensure Windows is up to date.
  2. Ensure DPM 2010 is up to date.
  3. Ensure you are running SQL Server 2008 R2 (I have SP1 — 10.50.2550.0)
  4. You are set to install DPM 2012 at this point. Install was simple – put in the disk, provide some passwords… next, next, next. Continue reading

Upgrade Steps Outline – SCVMM 2008 SP1 to 2012 SP1


 

System Center

What follows is the basic outline I followed to upgrade System Center Virtual Machine Manager 2008 SP1 running on a Windows Server 2008 R2 host to SCVMM 2012 SP1. Obviously each step has small libraries of documentation you could read, warning you could ignore, and whatnot – but if you’re simply looking to make sure you’ve got the right steps planned out, this is what I did to upgrade our setup:

  1. Make sure your OS / Data drive are at least 60 GB. You’ll need this for all the upgrades.
  2. Download SCVMM 2012 as well as SCVMM 2012 SP1. You can’t go straight to 2012 SP1 from 2008 SP1
  3. Upgrade SQL 2008 to 2008 R2 if you aren’t running it already. SCVMM 2012 SP1 doesn’t support 2008.
  4. BACKUP BACKUP BACKUP!
  5. Upgrade SCVMM to 2012
  6. Install SCVMM 2012 RU3  (http://support.microsoft.com/kb/2756127)
  7. Uninstall SCVMM 2012.
    I know, I know, but SCVMM 2012 does not support installation on Server 2012 and because there’s no direct upgrade path to SCVMM 2012 SP1 from 2008, you have to update the SCVMM database. Continue reading

Delete An Email From All Mailboxes – Exchange 2007


Ex-Mgmt-Shell

Another day, another user who decided to give away their username and password to a phishing email. Thankfully this time it happened on a Monday morning, the spammer was kind enough to send to my internal users, and even better sent a spam to our helpdesk email. In other words – they basically told me they were sending spam from one of our mailboxes.

I did the usual – disabled the account/changed the password, blocked the spam/phishing site, purged our (growing) mail queues. But this time I really wanted to get rid of the email. So…
Powershell (Exchange Management Shell) to the rescue. Continue reading