mohanpedala

Table of Contents

• set -e, -u, -x, -o pipefail
• set -e
• set -x
• set -u
• set -o pipefail
• Setting IFS
• Original Reference

set -e, -u, -x, -o pipefail

skyrocknroll

• SHOW TAG VALUES EXACT CARDINALITY WITH KEY = "index";
• SHOW SERIES CARDINALITY group by "measurement"; → Important useful one.
• influxdata/influxdb#8636 → Good examples are here
• influx_inspect report -detailed /var/lib/influxdb/data/envoy/autogen/903 The best way to ficure out high cardinality series.
• figure out series in each database use _internal ; select * from "database" where time > now() - 900s limit 10; Faced this error ERR: cannot delete data. DB contains shards using both inmem and tsi1 indexes. Please convert all shards to use the same index type to delete data.

find /var/lib/influxdb -type d -name index | while read index; do rm -Rf "$index" ; done
influx_inspect buildtsi -database envoy -datadir /var/lib/influxdb/data/ -waldir /var/lib/influxdb/wal

rbtr

kubectl get nodes --sort-by=".status.conditions[?(@.reason == 'KubeletReady' )].lastTransitionTime"

CSRaghunandan

#user  nobody;
worker_processes  4;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;

steven2358

FFmpeg cheat sheet

A list of useful commands for the FFmpeg command line tool.

Download FFmpeg: https://www.ffmpeg.org/download.html

Full documentation: https://www.ffmpeg.org/ffmpeg.html

Basic conversion

aasmith

# Typical use-case is decoding an AWS STS message. The DecodedMessage key contains escaped JSON.

jq '.DecodedMessage | fromjson | .' message.json

angelo-v

# will not work in all cases, see https://gist.github.com/angelo-v/e0208a18d455e2e6ea3c40ad637aac53#gistcomment-3439904

function jwt-decode() {
  sed 's/\./\n/g' <<< $(cut -d. -f1,2 <<< $1) | base64 --decode | jq
}

JWT=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiYWRtaW4iOnRydWV9.TJVA95OrM7E2cBab30RMHrHDcEfxjoYZgeFONFh7HgQ

jwt-decode $JWT

ipedrazas

kubectl get pods | grep Evicted | awk '{print $1}' | xargs kubectl delete pod

wagenet

glibc Versions

List of oldest supported version of top 10 Linux Distros and their glibc version according to distrowatch.com.

Summary

Out of all versions with published EOLs, 2.12 is the oldest glibc still active, found in CentOS 6.8.

If CentOS 6 and 7 are eliminated, the oldest glibc is 2.23 in Ubuntu and Slackware.

so0k

Kubectl output options

Let's look at some basic kubectl output options.

Our intention is to list nodes (with their AWS InstanceId) and Pods (sorted by node).

We can start with:

kubectl get no