I have a wall-mounted TV in the office where I want to show dashboards of different metrics. Cluster status, Nagios, network bandwidth, uptime, etc. They are all web-based and can be opened via web browser. I used Google Chrome and hit F11 to enter full screen mode to display my graphics. Since I have multiple … Read more
I had one system where the disk (sde)was formatted with a GPT partition, but fdisk did not show any partitions # fdisk -l /dev/sde WARNING: GPT (GUID Partition Table) detected on ‘/dev/sde’! The util fdisk doesn’t support GPT. Use GNU Parted. Disk /dev/sde: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 … Read more
I had an issue where a system refused to do any apt-get updates. I think the user must of tried running apt-get update and canceled half-way through. My usual trick of running apt-get clean did not work so well: E: Some index files failed to download. They have been ignored, or old ones used instead. … Read more
This guide discusses how to setup ZFS on Ubuntu 14.04.3 LTS, based from Aaron Toponce’s guide. Environment settings: Operating System: Ubuntu 14.04 LTS Setting up your host: Installation of the ZFS repository # sudo add-apt-repository ppa:zfs-native/stable Installation of ZFS dependencies # apt-get install spl-dkms Installation of Ubuntu ZFS # apt-get install -y ubuntu-zfs … Read more
Here is a quick and easy script that you can add to your crontab to monitor disk space consumption. Once you hit 85% disk utilization, you automatically send an email to yourself # cat space-monitor.sh #!/bin/bash #This script runs nightly to check disk space usage ADMIN=”macky@supermaru.com” df -h | grep -vE ‘^Filesystem|tmpfs|cdrom’ | awk ‘{print … Read more
Virtualization has made our lives easier. We can spin up new resources for applications, dynamically add more disk space, migrate them, etc. In vSphere, we can dynamically add additional memory and vCPU to a guest VM without any downtime (assuming its been enabled prior to powering on). Now in Ubuntu 12.04, I had two production … Read more
Ever wondered how do you find out what vCenter server is managing (or if there is any) a ESXi host? I’ve struggled for a while since there is no way via command line to see this information. vim-cmd, esxcli or esxcfg commands show nothing. I normally resorted to my Windows VM, launch the vSphere C# … Read more
Speedtest.net is one of my de-facto go-to websites when doing a sanity check on my network for throughput. Unfortunately it requires the Adobe Flash Player plugin, so in certain circumstances its too much of a hassle to get Flash installed or poor graphics on a VM, etc. So good thing is that there is a … Read more
Doing the first batches of vCenter Server Appliance (vCSA) 6.0 deployment was kinda…rough. Playing around with the OVA and getting annoyed at the web-based deployment option kind of slowed us down. At my current job we prefer vCSA’s for our Test and Dev environments and dont want to deal with Windows Server. Fortunately VMware has given … Read more
Here is a useful and quick one-liner command to get a RDP session from your Ubuntu system to a Windows host. Setup: Ubuntu 14.04 LTS VM Difficulty: Easy Setup time: <5 minutes You will have to install a program called rdesktop. Go ahead and run: # sudo apt-get install -y rdesktop Now that rdesktop is … Read more