With the release of Red Hat OpenStack 13, the move to containerized overcloud services is complete. Traditional systemd services such as RabbitMQ, Haproxy, Mariadb, etc, are all now running as containers in the overcloud.
troubleshooting
Linux: Using Tcpdump to Capture LLDP Info
According to Wikipedia, "Link Layer Discovery Protocol (LLDP) is a vendor-neutral link layer protocol in the Internet Protocol Suite used by network devices for advertising their identity, capabilities, and neighbors on an IEEE 802 local area network, principally wired Ethernet" LLDP is often what you will find running on non-Cisco switches and routers (which usually … Continue reading Linux: Using Tcpdump to Capture LLDP Info
Basic AIX Performance Troubleshooting Commands
Wow, today I logged into my first AIX Server in about 4.5 years. It was a horrible experience. I've been working with Redhat/CentOS pretty much exculsively for so long, I was mostly helpless to do anything of importance on the CLI other than create a few users and move some files around. None of the common commands that I am so used to using even exist in AIX.
RHEL6 – SELinux Troubleshooting II: Electric Boogaloo
So a good while back I posted an article on how to troubleshoot SELinux violations and after reviewing that article as part of a troubleshooting exercise, I realized that I left out a few details. Needless to say my original article was not as clear as it should be. Anyway I wanted to use up a few more bytes of the internet to clarify.
RHEL6 – Restore Grub on MBR
GRUB, which stands for the GRand Unified Bootloader is the default boot loader in Linux these days ( it replaced LILO). When your server boots, the system BIOS transfers control to the Master Boot Record of your first boot device which is where Grub is installed. If the removed, damaged, or overwritten, then you will not be able to boot, and in which case you will need to repair/reinstall grub.
Broadcom (bnx2) Network Adapters Dropping Recieved Packets Under Linux
VampSo a few weeks ago some of our Centos 5.4 and OEL 5.5 servers started exibiting strange connectivity problems. Monitoring started alerting that hosts were down when they weren't; some boxes could ping target hosts and some couldn't; some boxes became unresponsive when interfaces were failed over, and the strangest of all is that some of the boxes would magically "repair" themselves. Like I said, strange.
RHEL6 — Troubleshooting SELinux Violations
Dear Reader: Welcome to my third and not final instalment on SELinux. The first two can be read here and here. They are exciting reads and are sure to have you on the edge of your seat.
Anyway, the best way to implement SELinux sucessfully is to know how to troubleshoot when things aren't going your way. If you panic at the first sign of trouble, you are just going to end up turning off SELinux and not reap the rich rewards that it will bring you in life. Now that I have convinced you to run SELinux lets get started.