askalee
6/8/2018 - 7:38 AM

A customised docker ps with some extra information. Some techniques are used: (1) use `#xxx` as inline comments (2) use sed to filter lines

A customised docker ps with some extra information. Some techniques are used: (1) use #xxx as inline comments (2) use sed to filter lines (3) use awk to add new columns (4) use docker ps -format to get ps info we need (5) pass a bash variable to awk with -v option (6) force awk and column to use 'tab' as seperator instead of 'space'

dockerps.sh
content_copyfile_download
#!/bin/bash

# Get ip address of this machine
ipAddress="$(/sbin/ip -o -4 addr list eth0 2> /dev/null | awk '{print $4}' | cut -d/ -f1)"
if [ "$ipAddress"=="" ]; then
    ipAddress="$(/sbin/ip -o -4 addr list enp0s3 2> /dev/null | awk '{print $4}' | cut -d/ -f1)"
fi

# List containers
(
    echo 'ID    Image   Created Status  Ports   Names';
    docker ps --format '{{.ID}}\t{{.Image}}\t{{.CreatedAt}}\t{{.Status}}\t{{.Ports}}\t{{.Names}}'
)  \
   | sed -n '1p;/xb/p;/xrs/p'  `#filter relavent lines`   \
   | sed -E 's/80\/tcp(, )/..., /g'  `#hide port 80 info`       \
   | sed -E "s/443\/tcp(, )/..., /g" `#hide port 443 info`      \
   | sed -E "s/(..., )+/..., /g"     `#merge multiple...`       \
   | sed -E "s/ \+0800 CST//g"       `#remove time zone info`   \
   | awk -F '\t' -v ipAddress="$ipAddress"  'BEGIN {
          }
          {
              if (NR==1) {
                  print $0 "\tServiceUrl";
              } else {
                  printf $0;
                  where = match($5, /[0-9]+->5000\/tcp/);
                  if (where) {
                      wholePortExp = substr($5, RSTART, RLENGTH);
                      where = match(wholePortExp, /^[0-9]+/);
                      if (where) {
                          externalPort = substr(wholePortExp, RSTART, RLENGTH);
                      }
                  }

                  if (externalPort) {
                      printf("\thttp://%s:%s/api/v1.0\n", ipAddress, externalPort);
                  }
              }
          }' \
   | column -t -s $'\t'