MohamedAlaa

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

olih

Processing JSON using jq

jq is useful to slice, filter, map and transform structured json data.

Installing jq

On Mac OS

brew install jq

pydevops

• 0.1. References
• 0.2. Other cheatsheets
• 0.3. Manage multiple gcloud config configurations
  • 0.3.1. Switch gcloud context with gcloud config
• 0.4. Credentials
• 0.5. info
• 0.6. projects
• 0.7. zones & regions
• 0.8. Organization
• 0.9. billing

bcremer

systemd for Administrators

Chronological list of the "systemd for Administrators" series published on 0pointer.net/blog:

• Part I: Verifying Bootup
• Part II: Which Service Owns Which Processes?
• Part III: How Do I Convert A SysV Init Script Into A systemd Service File?
• Part IV: Killing Services
• Part V: The Three Levels of "Off"
• Part VI: Changing Roots

niainaLens

###
PERSONAL COLLECTION OF MEMO
by https://github.com/niainaLens
###

mtds

Virtual Networking on Linux

In the Linux Kernel, support for networking hardware and the methods to interact with these devices is standardized by the socket API:

                +----------------+
                |   Socket API   |
                +-------+--------+
                        |
User space              |

ssrihari

Postgres clusters and their nuances

Why

• Do you even need a cluster of postgreses? Why did we choose to create a cluster ourselves?
• Why didn’t RDS work for us? Why it might not work for you.
• What are other RDS like services out there?

Postgres side of things:

• What you need to know within postgres so your data can be streamed down to multiple nodes quick, and efficiently.

hvelarde

# get total requests by status code
awk '{print $9}' /var/log/nginx/access.log | sort | uniq -c | sort -rn

# get top requesters by IP
awk '{print $1}' /var/log/nginx/access.log | sort | uniq -c | sort -rn | head | awk -v OFS='\t' '{"host " $2 | getline ip; print $0, ip}'

# get top requesters by user agent
awk -F'"' '{print $6}' /var/log/nginx/access.log | sort | uniq -c | sort -rn | head

# get top requests by URL

namrata4

-- turn off paging (less/more)
psql> \pset pager off

/*
Pager usage is off.
*/

-- find an object name by id

SELECT OID, relname

ju2wheels

# Last updated: 08/24/2916
#
# Total instructions available: 18
#
# https://docs.docker.com/engine/reference/builder/
#
# You can use a .dockerignore file in the same context directory as
# your Dockerfile to ignore files in the context before sending them
# to the Docker daemon for building to speed up building.