Infrastructure Management

JR

One of our Network Engineers needed some monitoring (internal temp, external temp, and external humidity) added for an AVTech Room Alert 4E unit, preferably using a check_MK plugin. Couldn’t find one in any repos or in git, so decided to add this to a growing collection of plugins I’ve been working on. Another request from the same team: MinuteMan UPS units. I’ll be adding to my check_mk_bag git repo periodically with any new, custom check plugins.

JR

As of Cisco CDA Patch 2, identity mappings provided via Cisco ISE are natively supported. This means you can authenticate against ISE, which may in turn authenticate against LDAP or Active Directory, and subsequently notify one or more Cisco CDA servers that a new user-to-IP mapping exists. Cisco accomplishes this exchange of authenticated identities via syslog messages. ISE is configured to forward syslog messages to the CDA server(s), and the CDA server(s) have the sending ISE server(s) configured as a syslog “client.

JR

Some local Check_MK checks that were created to execute check_MK local check scripts (Powershell) in 64-bit context, monitor Exchange 2007 health (Storage Group replication status, Log Truncation after backups, etc.), and monitor DNS scavenging on Windows servers: @echo off REM Note that SysNative is available on x86 2008, and on x86 2003 with KB942589 applied set CONSOLE_WIDTH=500 CD %ProgramFiles(x86)%\check_mk\local-64 FOR /R %%X IN (”*“) DO ( %WINDIR%\SysNative\windowspowershell\v1.0\powershell.exe -File “%%X”) Execute-Local-64.bat view raw $Host.

JR

[][1]Inventoried replicated folders and their corresponding backlog counts Before you even get started, make sure your Powershell execution policy is set to RemoteSigned for your standard AND x86 Powershell console; Check_MK will generally execute PS scripts from the x86 console, so it’s critical to set the policy for both: Start > Accessories > Windows PowerShell Right-click ‘Windows PowerShell (x86)’, select ‘Run As Administrator’ Execute: Set-Execution Policy RemoteSigned Repeat the same steps above, but for the standard ‘Windows PowerShell’ console.

JR

If you need more output than what the existing Check of MySQL Status Variables includes, such as Seconds_Behind_Master or Relay_Log_Pos, consider adding a quick line to the bash call for _mysqlstatus on the agent. This assumes you’ve installed themysql_status-1.0.1.mkp and deployed the necessary agent files to the servers you’d like to monitor. This also assumes you’ve correctly configured the credentials needed to run the plugin and successfully receive (standard) output from the agent plugin.

JR

If you have redundant Windows 2008 DHCP servers (likely with split-scope configurations), you’re familiar with the problem of keeping reservations between the servers synchronized. I figured I’d post a script I created to sync reservations between servers. Synchronization can be 1-to-1 or 1-to-many, depending on your redundant DHCP server configuration. This script can sync with ALL authorized DHCP servers in a domain if needed. Make sure to read the included Powershell help information.

JR

Someone important suggested this get posted somewhere so that anyone else experiencing check_http socket timeout problems with client/servers running Microsoft System Center 2012 Endpoint Protection would have a clue as to what could be causing issues: If you’re receiving strange/unexpected timeouts from the check_http plug-in when running it against a server using Microsoft System Center 2012 Endpoint Protection, the Network Inspection Service may be blocking your check attempt. Don’t bother trying to force an agent string or any other weird options; either switch to header-checks-only [no body] using the -N option with check_http, or disable your Network Inspection service entirely (not recommended).

JR

Windows Security event logs fill up fast when you have Directory Service Access Auditing enabled, for whatever reason. If I want to retain any useful information, I need at least 7 to 14 days of logs to review, in my case, the DNS scavenging process. The built-in ‘Archive log when full’ option doesn’t really help out as much as you’d think, particularly when I might have 2 or 3 logs (each 300MB) per day.

JR

I’ve stumbled on a useful plug-in from Lars Michelsen that easily monitors a single Windows Server DHCP scope for usage using SNMPv2, but found this fell short of what I needed for monitoring several scopes at once. I’ve modified Lars’ original plugin/script to accommodate all available DHCP scopes on your monitored Windows server. You no longer need to add separate service definitions to monitor all available scopes. It’s worth noting a couple of important details:

JR

Well, I’ve finally deployed some production Openfiler ESA 2.99.1 machines as home-brew iSCSI boxes, primarily used for backups or low-stress virtual storage. Yes, they’re great — my basic write speeds on a Core 2 Duo box (recycled Dell Precision 390 workstation with 2GB of RAM and a single 1TB drive no RAID): [shell] [email protected]:/backup-iscsi$ sudo dd if=/dev/zero of=garbage bs=131072 count=20000 20000+0 records in 20000+0 records out 2621440000 bytes (2.6 GB) copied, 40.