ctop

by yadutaf

yadutaf / ctop

A command line / text based Linux Containers monitoring tool that works just like you expect.

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CTOP

A command line / text based Linux Containers monitoring tool that works just like you expect.

.. image:: https://github.com/yadutaf/ctop/raw/master/screenshots/screenshot.png

In a hurry?

.. code:: bash

curl -sSl https://raw.githubusercontent.com/yadutaf/ctop/master/cgroup_top.py > /opt/ctop && python /opt/ctop

Introduction

ctop
will help you see what's going on at the container level. Basically, containers are a logical group of processes isolated using kernel's cgroups and namespaces. Recently, they have been made popular by Docker and they are also heavily used under the hood by systemd and a load of container tools like lxc, rocket, lmctfy and many others.

Under the hood, ctop will collect all metrics it can from cgroups in realtime and render them to instantly give you an overview of the global system health.

It currently collects metrics related to cpu, memory and block IO usage as well as metadata such as owning user (mostly for systemd based containers), uptime and attempts to guess the container managing technology behind.

When the container technology has been successfully guessed, additional features are exposed like attaching to container (basically, it opens a shell in the container context) and stopping it.

ctop
author uses it on production system to quicky detect biggest memory users in low memory situations.

Features

  • collect cpu, pids, memory and blkio metrics
  • collect metadata like task count, owning user, container technology
  • sort by any column
  • filter by container type (docker, lxc, systemd, ...)
  • optionally display logical/tree view
  • optionally fold/unfold sub cgroup tree
  • optionally follow selected cgroup/container
  • optionnaly pause the refresh (typically, to select text)
  • detects Docker, LXC, unprivileged LXC, OpenVZ and systemd based containers
  • supports advanced features for Docker, LXC and OpenVZ based containers
  • detects qemu-kvm virtual machines (with libvirt only)
  • supports advanced features for qemu-kvm VMs (via virsh)
  • open a shell/attach to supported container types for further diagnose
  • stop/kill/chekpointing supported container types
  • click to sort / reverse
  • click to select cgroup
  • no external dependencies beyond Python >= 2.6 or Python >= 3.0

Note: since 2017-07-27, the reported memory will exclude cache memory to align on Docker design decision.

Installation

As a monitoring tool,

ctop
tries to be as discreet as possible. Nonetheless it still has some expectations. It will need at least Python 2.6 with builtin curses support to run. This is usually found with Debian 6 and newer.

This said, the recommended installation method relies on pip

.. code:: bash

pip install ctop ctop

If using pip is not an option, which is often the case on production systems, you may also directly grab the self-contained source file directly from github and run it in place. All you'll need is Python 2.6 (Debian Squeeze):

.. code:: bash

wget https://raw.githubusercontent.com/yadutaf/ctop/master/cgroup_top.py -O ctop chmod +x ctop ./ctop

Alternatively, if you are a Boot2docker user, you may install a Dockerized version of ctop instead. Please note that this is experimental. You have to have a docker binary inside your container to control / attach to your containers from ctop using this method:

.. code:: bash

docker pull yadutaf/ctop docker run --volume=/sys/fs/cgroup:/sys/fs/cgroup:ro --volume=/var/run/docker.sock:/var/run/docker.sock -it --rm yadutaf/ctop # Optionally, to resolve uids to usernames, add '--volume /etc/passwd:/etc/passwd:ro'

Usage

Command line:

.. code:: text

Monitor local cgroups as used by Docker, LXC, SystemD, ...

Usage: ctop [--tree] [--refresh=] [--columns=] [--sort-col=] [--follow=] [--fold=, ...] [--type=, ...] ctop (-h | --help)

Options: --tree Show tree view by default. --fold= Start with cgroup path folded --follow= Follow/highlight cgroup at path. --type=TYPE Only show containers of this type --refresh= Refresh display every [default: 1]. --columns= List of optional columns to display. Always includes 'name'. [default: owner,processes,memory,cpu-sys,cpu-user,blkio,cpu-time]. --sort-col= Select column to sort by initially. Can be changed dynamically. [default: cpu-user] -h --help Show this screen.

Control:

  • press
    p
    to toggle/pause the refresh and select text.
  • press
    f
    to let selected line follow / stay on the same container. Default: Don't follow.
  • press
    q
    or
    Ctrl+C
    to quit.
  • press
    F5
    to toggle tree/list view. Default: list view.
  • press
    and
    to navigate between containers.
  • press
    +
    or
    -
    to toggle child cgroup folding
  • click on title line to select sort column / reverse sort order.
  • click on any container line to select it.

Additionally, for supported container types (Currently Docker, LXC and OpenVZ):

  • press
    a
    to attach to console output.
  • press
    e
    to open a shell in the container context. Aka 'enter' container.
  • press
    s
    to stop the container (SIGTERM).
  • press
    k
    to kill the container (SIGKILL).
  • press
    c
    to checkpointing the container(OpenVZ only now - run 'vzctl chkpnt CTID')

Requirements

  • python >=2.6 or python >=3.0, with builtin curses support

Licence

MIT

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