So I was recently messing with Docker to keep up on my skills, and I wanted to see how much resources were required by each container over a given time period. So I came up with the following command to run in the terminal to collect it.
FILE=dockerStats.out
docker stats -a --no-stream | head -n 1 | tr -d / > $FILE
while true
do
docker stats -a --no-stream | \
tail -n+2 | \
ts
done | tr -d / >> $FILEThis command will produce an output similar to the following (details removed):
CONTAINER ID NAME CPU % MEM USAGE LIMIT MEM % NET IO BLOCK IO PIDS
Jul 23 19:28:43 ece662a6f8f5 container_xxxx_0 0.00% 2.758MiB 15.26GiB 0.02% 10.3kB 0B 0B 0B 2
Jul 23 19:28:43 dfb14d35d485 container_xxxx_1 0.02% 79.5MiB 15.26GiB 0.51% 12.2kB 1.44kB 0B 0B 5Important parts to note include the ts command this prepends the
time stamp to every linen of output, it’s from the moreutils package.
An alternate option would be to use xargs and date to add the
time stamp, but every line but this is cleaner and faster cause
otherwise we would be starting a lot more processes.
The tr command is used to remove the extra slashes as we don’t need
them. The head and tail commands are used to capture only the parts
of the output we’re interested in like the headers or without the
headers.
Things that could be improved are the formatting of the columns to be truly fixed width, and adding a date header, but it’s good for very quick analysis in whatever your favorite tool is. Mine just happens to currently be Excel for the power of pivot tables.