PostgreSQL: About Pool Sizing

Source: About Pool Sizing

Git: The art of rebase

Source: Always Squash and Rebase your Git Commits
[Edit]: Squash the Last X Commits Using Git

Clojure: create a Clojure docker

Use case: I need to run some Clojure tests that use a library depending on glibc 2.14.
Unfortunately, I use CentOS 6.9 that relies on glibc 2.12, that cannot be updated.
Solution: Use a Docker file to run the Clojure tests.

Source: https://store.docker.com/images/clojure

docker pull clojure

• Dockerfile

FROM clojure
RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app
COPY project.clj /usr/src/app/
RUN lein deps
COPY . /usr/src/app
RUN lein uberjar
CMD ["lein", "test"]

• docker.build.sh

set -x
cd ~/av-usage
cp ~/tmp/clojure/docker/Dockerfile Dockerfile.test
docker build -f Dockerfile.test -t av-usage-test .
rm Dockerfile.test

• docker.run.sh

set -x
docker run -it --rm --name my-av-usage-test av-usage-test

Git: Reset local branch to remote HEAD

Source: Reset local repository branch to be just like remote repository HEAD

git fetch origin
git reset --hard origin/master

yum: installed package

yum list installed | grep glibc

PostgreSQL: pgbouncer details

• what-is-the-point-of-bouncing
• decrypting-pgbouncers-diagnostic-information