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Some days ago I saw an amazing blat’s tweet. His code changed your prompt advertising you if your DOCKER_HOST variable was set. I have made some “improvements” to differentiate connections to simple docker hosts and swarm clusters.
Usually swarm cluster are listening in 4000 or 3376 port and docker engine in 2375 or 2376 port, so, that’s what I use to check it.
This way you can advertise easily if you are pointing your docker variables to a remote docker engine or a swarm cluster.
# Parse DOCKER_HOST. Expecting this format: DOCKER_HOST="tcp://swarm-node-01.stackvdi.com:4000"
function __docker_prompt {
if [ -n "$DOCKER_HOST" ]; then
DOCKER_PORT=` echo "$DOCKER_HOST" | cut -d ':' -f3 `
DOCKER_HOSTNAME=`echo $DOCKER_HOST | cut -d ':' -f2 | cut -d '/' -f3`
# Si es una ip, la colocamos directamente, si no, cortamos el dominio
if [[ $(echo $DOCKER_HOSTNAME | grep -v -E '((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)') ]]; then
DOCKER_HOSTNAME=`echo $DOCKER_HOSTNAME | cut -d '.' -f1`
fi
if [ "$DOCKER_PORT" = "3376" ] || [ "$DOCKER_PORT" = "4000" ]; then
## Estamos conectados a un swarm cluster
echo "(🐳🐳🐳 $DOCKER_HOSTNAME)"
else
echo "(🐳 $DOCKER_HOSTNAME)"
fi
fi
}
export CLICOLOR=1
export LSCOLORS='ExFxCxDxBxegedabagaced'
alias ls='ls --color'
function prompt {
local BLACK="\[\033[0;30m\]"
local RED="\[\033[0;31m\]"
local GREEN="\[\033[0;32m\]"
local YELLOW="\[\033[0;33m\]"
local BLUE="\[\033[0;34m\]"
local PURPLE="\[\033[0;35m\]"
local CYAN="\[\033[0;36m\]"
local WHITE="\[\033[0;37m\]"
local WHITEBOLD="\[\033[1;37m\]"
export PS1="\u@\h:${BLUE}\$(__docker_prompt)${WHITE}\w$ "
export PS1="\[\033[G\]$PS1"
}
promptYou can see how it looks like:
