Install the prerequisites. Below works for Debian-based distros such as Ubuntu/Mint: apt-get install libzookeeper-mt-dev Install python libraries: pip install zkpython pykeeper Example code below shows making a connection, getting the names of some child nodes and pulling info from each of those child nodes: import pykeeper import json client = pykeeper.ZooKeeper(‘192.168.1.2:2181’) client.connect() coords = client.get_children(‘/druid/coordinator/_COORDINATOR’)… Read more »
Posts By: jonny
Install check_mk on Ubuntu 18.04
Ubuntu 18.04 includes check-mk in the repository version but it is an older version 1.2.8 (at the time of writing). Download check mk raw (get the latest stable URL from the website) : wget https://mathias-kettner.de/support/1.5.0p7/check-mk-raw-1.5.0p7_0.bionic_amd64.deb Try installing it: dpkg -i dpkg -i check-mk-raw-*.deb You may get dependency issues which can be resolved with: apt-get install… Read more »
iDRAC 9 Set Physical Disk to Non-RAID
In the update from iDRAC 8 to iDRAC 9 it has been infuriating searching the ‘Storage’ menu only to discover that the storage is managed under ‘Configuration > Storage Configuration’ I’m convinced the user experience could be better! At the very least a link through for configuration.
Clearing old Journald Logs
Journald logs can be cleared by timescale or size as follows. Keep only 5 days worth of logs journalctl –vacuum-time=5d Retain only the past 500 MB: journalctl –vacuum-size=500M
Checking if Puppet is Disabled
The puppet agent can be disabled from running with: puppet disable “Some message here” And it can be re-enabled with: puppet enable But to check if puppet is currently disabled there is no check command. Instead look for the existence of the agent_disabled.lock file under: $vardir/state/agent_disabled.lock For the systems I was checking this was at:… Read more »
Exclude Directories for Disk Usage (du)
I sometimes want to omit directories from my disk usage (du -sh *) checks. This includes virtual files systems such as proc / dev and also mounts to other filesystems (data in the example below). This is what works for me: du –exclude={proc,sys,dev,data} -sh * The equals sign appears to be optional and worked both… Read more »
Joining Multi-line Output with Paste
I was checking the memory on approximately 140 servers using ansible: ansible –user root -k -i servers.list -m shell -a “free -h; mysql” test but the output appears over several lines e.g. server103.domain.dev | SUCCESS | rc=0 >> total used free shared buffers cached Mem: 94G 44G 49G 59M 203M 4.6G -/+ buffers/cache: 39G 54G… Read more »
Datanode denied communication with namenode
In a Cloudera cluster we had a few nodes reporting the following error message in the logs under hadoop-cmf-hdfs-DATANODE-whatever.com.log.out The error included: Datanode denied communication with namenode because the host is not in the include-list: : DatanodeRegistration One solution could be to ‘Refresh Node List’ as shown in the screenshot below. Find it by clicking… Read more »
Set NTP Server on Windows Domain Controller
On the Windows Domain Controller I checked the current NTP settings with: w32tm /query /configuration I tried a few alternative commands and got errors such as “the rpc server is unavailable”. The command that worked was: w32tm /config /manualpeerlist:time.windows.com /syncfromflags:manual /reliable:yes /update After issuing that command I could see the ntp server listed when… Read more »
Windows Nagios Checks using NSClient
I wanted to add some checks to a Windows server and the methods seem to have changed a little over the years. At the moment I have amended the nsclient.ini file on the Windows box with: CheckDisk=1 CheckSystem=1 Then from the Nagios box I can check CPU with a threshold as follows: /usr/lib64/nagios/plugins/check_nrpe -H winserver001.domain.tld… Read more »
