Skip to content

Instantly share code, notes, and snippets.

View cynici's full-sized avatar

Cheewai cynici

View GitHub Profile

A funky shell thingy that I've never seen before

So you're in posix sh and you want to do the equivalent of this in bash:

foo | tee >(bar) >(baz) >/dev/null

(Suppose that bar and baz don't produce output. Add redirections where needed if that's not the case.)

@mmornati
mmornati / default.yaml
Last active December 28, 2021 03:51
default.yaml
# ===================================================================== #
# BASIC CONFIGURATION
# ===================================================================== #
# Arch: "default", "x86_64", "aarch64".
# "default" corresponds to the host architecture.
arch: "default"
# An image must support systemd and cloud-init.
# Ubuntu and Fedora are known to work.
@zobayer1
zobayer1 / fedora_post_install.md
Last active April 4, 2024 12:06
Fedora 36 post installation notes for software developers. Things you should do after installing your new Fedora 36 workstation.

Fedora 36 Post Installation (For Software Developers)

Top N things you should do after installing or upgrading to your new Fedora 36 workstation.


Settings

Change Hostname

@max-rocket-internet
max-rocket-internet / prom-k8s-request-limits.md
Last active May 17, 2024 08:02
How to display Kubernetes request and limit in Grafana / Prometheus properly

CPU: percentage of limit

A lot of people land when trying to find out how to calculate CPU usage metric correctly in prometheus, myself included! So I'll post what I eventually ended up using as I think it's still a little difficult trying to tie together all the snippets of info here and elsewhere.

This is specific to k8s and containers that have CPU limits set.

To show CPU usage as a percentage of the limit given to the container, this is the Prometheus query we used to create nice graphs in Grafana:

sum(rate(container_cpu_usage_seconds_total{name!~".*prometheus.*", image!="", container_name!="POD"}[5m])) by (pod_name, container_name) /
{
"install": "pip3 install --user -r requirements.txt",
"start": "PYTHONUNBUFFERED=true python3 server.py",
"watch": {
"ignore": [
"\\.pyc$"
],
"install": {
"include": [
"^requirements\\.txt$"
@kentonv
kentonv / SCM_RIGHTS.md
Last active November 4, 2023 17:10
SCM_RIGHTS API quirks

As tested on Linux:

  • An SCM_RIGHTS ancillary message is "attached" to the range of data bytes sent in the same sendmsg() call.
  • However, as always, recvmsg() calls on the receiving end don't necessarily map 1:1 to sendmsg() calls. Messages can be coalesced or split.
  • The recvmsg() call that receives the first byte of the ancillary message's byte range also receives the ancillary message itself.
  • To prevent multiple ancillary messages being delivered
@yanivmn
yanivmn / open-source-sso.md
Last active April 11, 2024 13:33 — forked from bmaupin/open-source-sso.md
Comparison of open-source SSO implementations
Aerobase Keycloak WSO2 Identity Server Gluu CAS OpenAM Shibboleth IdP
OpenID Connect/OAuth support yes yes yes yes yes yes third-party
Multi-factor authentication yes yes yes yes yes yes yes
Admin UI yes yes yes yes yes yes no
OpenJDK support yes yes yes yes no
Identity brokering yes yes yes
Middleware NGINX, Wildfly Wildfly, JBOSS WSO2 Carbon Jetty, Apache HTTPD any Java app server any Java app server Jetty, Tomc
@jmassardo
jmassardo / RemoveStaleChefNodes.sh
Created August 21, 2018 13:53
Simple script to remove old nodes from a Chef Server
for node in $(knife search node "ohai_time:[* TO $(date +%s -d '30 days ago')]" -i); do
knife client delete $node
knife node delete $node
done
@bmaupin
bmaupin / open-source-sso.md
Last active April 11, 2024 09:36
Comparison of some open-source SSO implementations

ⓘ This list is not meant to be exhaustive and is not guaranteed to be maintained. See the comments for updates and alternative options.

(Items in bold indicate possible concerns)

Keycloak WSO2 Identity Server Gluu CAS OpenAM Shibboleth IdP
OpenID Connect/OAuth support yes yes yes yes yes yes
Multi-factor authentication yes yes yes yes yes yes
Admin UI yes yes yes yes yes no
OpenJDK support yes yes partial² yes
@StevenACoffman
StevenACoffman / fluent-filebeat-comparison.md
Last active April 2, 2024 22:34
Fluentd Fluent-bit FileBeat memory and cpu resources

Fluent-bit rocks

A short survey of log collection options and why you picked the wrong one. 😜

Who am I? Where am I from?

I'm Steve Coffman and I work at Ithaka. We do JStor (academic journals) and other stuff. How big is it?

Number what it means
101,332,633 unique visitors in 2017