Hello to everyone . Is there a way that I can check for each container that i have create , cpu utilization and all this stuff from the command line ? Something like the top command maybe ?
Short answer not really
Long answer you can get there or there abouts but its work (hopefully someone has some nifty script)
Isn’t there something like top command ? I found lxc-top but it shows nothing despite i have create a container. In fact i create the container through lxd , so i guess it is normal that lxc-top gives me zero output
Yeah if you wanna see the process, go on the host install htop, run htop press f5 (tree) then f3 (search) yourContainerName it will show you all the processes
LXD has lxc info mycontainer, which gives you some information.
Each Linux container is essentially a process tree that is separated from the rest of the host’s processes through cgroups. What you need, is software that understands cgroups and groups together the load of each process tree (a.k.a. Linux container).
See, for example, ctop.
Alternatively, there are tools like netdata that you install on the host and can give you instant insight into the containers.
Thanks a lot both of you for your answers.
Hi Thodoris,
here is a shell script, that you maybe can extend to your needs:
#!/bin/bash
lxc_list=$(lxc list --format=json | jq '.[] | "\(.name) \(.state.memory.usage) \(.state.processes) \(.state.cpu.usage) \(.state.network.eth0.counters.bytes_received) \(.state.network.eth0.counters.bytes_sent)"')
format="%15s %16s %12s %18s %12s %12s\n"
printf "$format" name memusage procs cpu recv sent
while IFS=\ read name memusage processes cpuusage bytes_received bytes_sent; do
name=$(echo "$name"|cut -c 2-) # remove the first character (a quote)
bytes_sent=$(echo "$bytes_sent"|rev|cut -c 2-|rev) # remove the last character (a quote)
printf "$format" $name $(echo "$memusage"|numfmt --to=si --suffix=B) \
$processes \
$cpuusage \
$(echo "$bytes_received"|numfmt --to=si --suffix=B) \
$(echo "$bytes_sent"|numfmt --to=si --suffix=B)
done <<< "$lxc_list"
It creates something like:
name memusage procs cpu recv sent
lxd-dashboard 299MB 120 129182767000 50KB 14KB
nextcloud 116MB 255 3027363446000 777MB 115MB
rocket-chat 377MB 120 109302610000 44KB 15KB
ubuntu22 267MB 122 137490014000 57KB 14KB
wordpress 335MB 120 122135800000 54KB 14KB
Btw, @Stephane (maybe knows that): What unit has cpu.usage? How to show some more meaningful? (like a percentage of the host-cpu i.e. - any idea?)
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@tkasidakis
Have a look at systemd-cgtop e.g. systemd-cgtop --depth=1 -p
otherwise you can use lxc exec <container> -- [top | htop | btop | etc...]
GNU Parallel will also help you run things in … well parallel 
.
LXD does have metrics exporter and a Grafana dashboard you can use for this, see:
I simplyfied this aproach to be put into an shell alias:
alias lxcstats="printf \"%-20s %-8s %-5s %-5s %-s\n\" name status mem disk cpu-time; lxc list status=running --format=json | \
jq -r '.[] | \"\(.name) \(.status) \(.state.memory.usage) \(.state.disk.root.usage) \(.state.cpu.usage)\"' | \
numfmt --field=3,4 --to=iec|\
printf '%-20s %-8s %-5s %-5s %(%-dd %-Hh %-Mm )T\n' \$(</dev/stdin)"
btw: state.cpu.usage are cpu miliseconds
1 Like
I am sharing this for future google searches. This should also work with the LXD fork of INCUS.
The --verbose is useful to see the commands being sent to containers you can remove it.
The -q is critical to prevent parallel from stripping the quotes
The backslashes can be removed they are useful for line breaks on a long single line command.
# Parallel be verbose, handle quotes, jobs use all cores
# If you have many containers consider limiting cores -j4
parallel --verbose -q -j+0 \
# The ::: is a Parallels parameter
# The {} is replaced by the container name from the commands after :::
lxc exec {} -- bash -c "apt-get update && apt-get upgrade -y" ::: \
# List json data pipe into jq command, parse containers that are Ubuntu
# alter these values for alpine, Arch, etc.
# currently running then trim to clean it up.
$(lxc ls -f json | jq '.[] | \
select(.type == "container") | \
select(.config."image.os" == "ubuntu") | \
select(.status == "Running") | .name' | tr -d '"')
# Results in:
# <container1>
# <container2>
# ...
Each container replaces {} and executes the commands.
Here it is on a single line:
parallel -q -j+0 lxc exec {} -- bash -c "apt-get update && apt-get upgrade -y" ::: $(lxc ls -f json | jq '.[] | select(.type == "container") | select(.config."image.os" == "ubuntu") | select(.status == "Running") | .name' | tr -d '"')
You can turn this into a shell script or use the pet command to load it into a collection of long commands for easy access. The pet command can also do snippets so if you wanted this to run for a specific host you can do so. Or if you want to change the inputs to jq query. i.e. prompt for these values before running the shell one-liner.
If you are curious about the Grok3 session. I was definitely impressed by how well it was able to assist me.