If you will every need to locally render an MD file, e.g. reading some documentation, you can use the glow [1] program. It renders a MD file in the terminal.
In the case of GitHub repository, an alternative is to use the grid [2] project. It sets a local webserver using the GitHub markdown API. It produces a local view of MD files as they would be in the GitHub website.
One of the most annoying thing when working with terraform is the size of output of the terraform plan command. For more complex environments, it easily can get to many thousand lines, even for what seems to be a small change. It makes very hard to confirm that a code change does not have a side effects.
It would be nice to have the summary option, showing only resources and modules changed. I guess one day such feature will be added. In the meantime, I thought to use the grep command on the terraform plan output. It wasn't easy, because the output contain a few control character. After quite a few attempts, I found that following regex is a substitute.
terraform plan | grep -E "^[[:cntrl:]][[:print:]]+[[:space:]]+#\ "
Imagine you have quite a few AWS accounts. In one of them, you don't know which one, there is an S3 bucket. The AWS CLI with awk and zsh can help to find it.
In the first step, let's prepare a list of all accounts, or rather profiles from the AWS CLI config (the ~/.aws/config file).
accounts=($(awk -F "( |])" '/profile sso/ {print $2}' ~/.aws/config))
In the example, we limit the list only to profiles with the prefix "sso". The command uses awk to find any line with the string "profile sso" and print the second field from it. However, it does no use the standard field separator. There are 3 characters working as a separator: space, "|" and "]". Please also note the awk command is two pairs of "()".
The list is saved into the accounts variable and used in the second command. It lists all s3 buckets from each account, and grep for the selected string, which of course can be the whole bucket name.
p=sso-prod bucket=my-company-not-so-important-bucketfor accounts ($accounts) {echo $account; aws s3 ls --profile $p| grep $bucket}
Sometimes it is good to look at a network from the inside of a kubernetes cluster. Well-prepared images do not have any useful networking tools (because they are minimal image designed to do specific task). Therefore, you might need to run commands from a dedicated container. An example of such tool is the netshoot image. It can be found in GitHub: https://github.com/nicolaka/netshoot
It's very easy to run:
kubectl run tmp-shell --rm -i --tty --image nicolaka/netshoot
There is the Jenkins Plugin to set log export to Splunk. In Splunk Marketplace you can find the Splunk App for Jenkins, but the app works only for Splunk Enterprise, not the Cloud edition. Documentation describe how to connect Jenkins to Splunk. It includes values for cloud deployment as well as on-premises one. Thanks to that, the connection was easy to establish, but there were no logs from Jenkins. I had to manually created 4 indexes (I got them from this discussion) to get Jenkins logs visible in Splunk.
Recently, I've spent some time trying to make Sims 4 running on Linux. (That's the way you might spend time when you have a growing up daughter.) The ProtonDB entry was (and still is) GOLD, so it was encouraging. However, it didn't work on the first computer I tried. Steam client showed the game ran, but there was no window. Neither for the Sims 4 game, nor for the Origin client. It was:
Then I tried on my Crux machine, and it worked fine. I don't remember if I had to add PROTON_USE_WINED3D=1. The machine had:
So I thought that maybe GPU from the original machine was too old, or NVidia drivers were causing problems. I replace the Nvidia GPU an AMD FirePro V5900 card. It didn't help.
The next step was to run a test on my old Dell XPS-13 laptop. I installed the OpenSuse Leap 15.3 on it. I played a bit with Proton version, but in the end Sims started with the Proton 7.0rc2-GE-1, the latest release from the Glorious Eggroll branch.
In the same time, I realized that I could swap CPUs between machines. The Ryzen had the build in Vega GPU core, which was not in use. The first phase was to check that Sims 4 could start on CRUX without discrete GPU. It worked fine. Then I swapped the CPUs (with motherboards). The CRUX (with Intel CPU and AMD GPU) worked fine, but the Mint with AMD Ryzen (and integrated AMD GPU) still struggled. I tried using the Proton from GE branch, which helped me on OpenSuse. No luck.
I started to consider that something wrong is with Mint. The Sims 4 problem seems to be the problem with Origin client. The first relatively easy change was to use the KDE instead of Cinnamon as a Window Manager for the Mint system. It didn't help. Next was to install OpenSuse along Mint. The only change compared to the Dell laptop was to use the Tumbleweed rather than the Leap edition.
This time it worked fine. No issues. In conclusion, there is something wrong with Mint, but Sims 4 and Origin client works fine on Linux with Steam.
From time to time I need to check some details of the hardware in one of my Linux server. There is a good command to do this, which I know exists and have good functionality, but cannot remember the actual text to call it. The command in question is:
dmidecode
And below links with examples and explanation how to use it:
If you every need to check what are the actual password in Jenkins credentials check this small groovy script by Tim Jacomb. I helped me to confirm that credentials were corrupted during saving and restoring with Configuration as a Code plugin.
To use it (and any other groovy script). In your Jenkins:
After my OS update to Crux 3.6 (3.6.1 to be precise) I cleaned non-main (core, opt, xorg) packages. One of the side effects is that I lost abcde. It was removed from the contrib collection, because of inactive maintainer. Along abcde, the cd-discid was also deleted from the same reason. I decided to add them to my port collections (https://wawrzek.name/crux/repo/). I started from the old contrib ports. Looking at sources I noticed that there is a recent patch for cd-discid. I included it into my port. I also encounter problems in running abcde with my config. There were missing musicbrainz Perl modules, so I added ports for them as well.
For some reason PulseAudio wants to send sounds from my computer to the HDMI monitor, with rather crappy speakers, rather than to my headphones.
To stop it I set up a default output by editing /etc/pulse/default.pa. In my case the right configuration was:
set-default-sink alsa_output.pci-0000_38_00.6.analog-stereo
At the moment, my Linux (CRUX 3.5) does not load a kernel module for the my mainboard monitoring chipset. The mainboard is GigaByte GA-M68MT-S2 and the chip is Nuvoton NCT6775F. I need data from that chip for Conky or LM Sensors. To ensure it's available I've modified the /etc/rc.modules file, by adding
modprobe nct6775
molecule converge -- -vvvvMolecule own debug information can be printed to the standard output with *--debug** option, but it has be specify without molecule command. For example:
molecule --debug convergeOf course, both can be mixed togther:
molecule --debug converge -- -vvvv
Virtual, for ever I was fascinating with maps of our star neighbourhood. Just like the one from European Southern Observatory website. Recently, I've enjoyed playing Elite Dangerous. I enjoy it even more, because it works perfectly fine on Linux (with Proton). One of the great thing about Elite is freedom to roam between stars and visit, so many star neighbourhoods.
The amount of stars is breathtaking. It's hard to visualize the ones which are close to the system you are in. So, I wrote a small Python script to get data from edsm and prepare them to be visualized with GNUplot.
Home, sweet home.
These are the commands to produce the SVG output after loading script and data into Gnuplot.
set term svg size 1600,1200 set view 45, 290, 1.25, 1.5 set output 'sol-r15.svg'; replot
I didn't know that the space around Achenar is so empty (OK. I don't have permit yet).
These are the commands to produce the SVG output after loading script and data into Gnuplot.
set term svg size 1600,1200 set view 45, 275, 1.25, 1.5 set output 'achenar-r15.svg'; replot
A few commands to help in checking and adjusting kernel module options:
Of course $KERNEL_MODULE, as well as all other strings with "$" at the beginning, has to be replaced by appropriate value.
In CRUX /etc/default/grub does not exist, so it has to be created.
Useful links
This is a small script helping in setting up a new kernel. It copies files from the Linux kernel source directory and builds the matching initramfs file.
#!/bin/sh
#
set -x
if [ $(dirname $PWD) != '/usr/src' ]
then
echo ""
echo "Please change directory to a one with Linux kernel sources"
exit 1
fi
version=$(basename $PWD |awk -F\- '{print $2}')
ls boot/vmlinuz-${version}-* 2> /dev/null && \
build=$(ls -1 /boot/vmlinuz-${version}-*| sort -n | awk -F\- '{print $3}') || \
build=1
release=${version}-${build}
cp System.map /boot/System.map-${release}
cp arch/x86/boot/bzImage /boot/vmlinuz-${release}
mkinitrd /boot/initramfs-${release}.img ${version}
grub-mkconfig > /boot/grub/grub.cfg
Imagine that you want to use Molecule to test an Ansible role with a not default value. That's just one off test, so adjusting molecule configuration in the converge.yml (or similar) file is not required. It's not very prominent in documentation, but you can pass Ansible variables after "--" (minus, minus) in the molecule commend. For example:
molecule converge -- -e "role_new_var=true"
Imagine that you need to try to find a word in hundreds files located in a plenty of subfolders. grep -Rc might be a good candidate, but it's going to print the list of all files and the word is in just a handful of them. To make the output better grep can be joined with awk (and in the example below with zsh).
I needed to find an example of sqlcmd command usage in my Ansible roles collection. I used the power of ZSH globbing (a few other examples can be found here and in other places) to limit search to yml file only. ZSH "**" pattern is also a nice replacement to the grep "--recursive"option. In awk the "-F" flag replaces the standard delimiter with the ":" character and prints only lines with second field not equal to zero.
grep -c sqlcmd **/*.yml | awk -F":" ' ($2 != 0 ){print $0}'
curl -H Metadata:true \ "http://169.254.169.254/metadata/instance/network/interface/0/ipv4/ipAddress/0/publicIpAddress?api-version=2017-08-01&format=text"
curl -H Metadata:true \ "http://169.254.169.254/metadata/instance/network/interface/0/ipv4/ipAddress/0/privateIpAddress?api-version=2017-08-01&format=text"
vacuum full
/usr/lib/postgresql/10/bin/oid2name -H localhost -U postgres -d postgres -f 24806
From database "postgres":
Filenode Table Name
--------------------------
24806 pg_toast_24729
SELECT table_schema,
table_name,
pg_relation_filepath('"'||table_schema||'"."'||table_name||'"')
FROM information_schema.tables
WHERE
pg_relation_filepath('"'||table_schema||'"."'||table_name||'"')
LIKE 'base/12404/248%';
SELECT
table_schema,
table_name,
pg_relation_size('"'||table_schema||'"."'||table_name||'"')
FROM information_schema.tables
ORDER BY 3
LIMIT 10
runscripts yes # (no|yes)
PKGMK_IGNORE_MD5SUM="yes"