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A tiny but valid `init` for containers

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Tini - A tiny but valid
for containers

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Tini is the simplest

you could think of.

All Tini does is spawn a single child (Tini is meant to be run in a container), and wait for it to exit all the while reaping zombies and performing signal forwarding.

Why Tini?

Using Tini has several benefits:

  • It protects you from software that accidentally creates zombie processes, which can (over time!) starve your entire system for PIDs (and make it unusable).
  • It ensures that the default signal handlers work for the software you run in your Docker image. For example, with Tini,
    properly terminates your process even if you didn't explicitly install a signal handler for it.
  • It does so completely transparently! Docker images that work without Tini will work with Tini without any changes.

If you'd like more detail on why this is useful, review this issue discussion: What is advantage of Tini?.

Using Tini

NOTE: If you are using Docker 1.13 or greater, Tini is included in Docker itself. This includes all versions of Docker CE. To enable Tini, just pass the

flag to
docker run

NOTE: There are pre-built Docker images available for Tini. If you're currently using an Ubuntu or CentOS image as your base, you can use one of those as a drop-in replacement.

NOTE: There are Tini packages for Alpine Linux and NixOS. See below for installation instructions.

Add Tini to your container, and make it executable. Then, just invoke Tini and pass your program and its arguments as arguments to Tini.

In Docker, you will want to use an entrypoint so you don't have to remember to manually invoke Tini:

# Add Tini
ADD${TINI_VERSION}/tini /tini
RUN chmod +x /tini
ENTRYPOINT ["/tini", "--"]

Run your program under Tini

CMD ["/your/program", "-and", "-its", "arguments"]

or docker run your-image /your/program ...

Note that you can skip the

under certain conditions, but you might as well always include it to be safe. If you see an error message that looks like
tini: invalid option -- 'c'
, then you need to add the

Arguments for Tini itself should be passed like

in the following example:
/tini -v -- /your/program

NOTE: The binary linked above is a 64-bit dynamically-linked binary.

Signed binaries


binaries are signed using the key

You can verify their signatures using

(which you may install using your package manager):
ADD${TINI_VERSION}/tini /tini
ADD${TINI_VERSION}/tini.asc /tini.asc
RUN gpg --batch --keyserver hkp:// --recv-keys 595E85A6B1B4779EA4DAAEC70B588DFF0527A9B7 \
 && gpg --batch --verify /tini.asc /tini
RUN chmod +x /tini

Verifying binaries via checksum


binaries have generated checksums (

You can verify their checksums using

(which you may install using your package manager):
RUN wget --no-check-certificate --no-cookies --quiet${TINI_VERSION}/tini-amd64 \
    && wget --no-check-certificate --no-cookies --quiet${TINI_VERSION}/tini-amd64.sha256sum \
    && echo "$(cat tini-amd64.sha256sum)" | sha256sum -c

Alpine Linux Package

On Alpine Linux, you can use the following command to install Tini:

RUN apk add --no-cache tini
# Tini is now available at /sbin/tini
ENTRYPOINT ["/sbin/tini", "--"]


Using Nix, you can use the following command to install Tini:

nix-env --install tini


On Debian (Buster or newer), you can use the following command to install Tini:

apt-get install tini

Note that this installs

), not

Arch Linux

On Arch Linux, there is a package available on the AUR. Install using the official instructions or use an AUR helper:

pacaur -S tini

Other Platforms

ARM and 32-bit binaries are available! You can find the complete list of available binaries under the releases tab.




argument can be used for extra verbose output (you can pass it up to 3 times, e.g.


By default, Tini needs to run as PID 1 so that it can reap zombies (by running as PID 1, zombies get re-parented to Tini).

If for some reason, you cannot run Tini as PID 1, you should register Tini as a process subreaper instead (only in Linux >= 3.4), by either:

  • Passing the
    argument to Tini (
    tini -s -- ...
  • Setting the environment variable
    export TINI_SUBREAPER=

This will ensure that zombies get re-parented to Tini despite Tini not running as PID 1.

NOTE: Tini will issue a warning if it detects that it isn't running as PID 1 and isn't registered as a subreaper. If you don't see a warning, you're fine.

Remapping exit codes

Tini will reuse the child's exit code when exiting, but occasionally, this may not be exactly what you want (e.g. if your child exits with 143 after receiving SIGTERM). Notably, this can be an issue with Java apps.

In this case, you can use the

flag to remap an arbitrary exit code to 0. You can pass the flag multiple times if needed.

For example:

tini -e 143 -- ...

Process group killing

By default, Tini only kills its immediate child process. This can be inconvenient if sending a signal to that process does not have the desired effect. For example, if you do

docker run krallin/ubuntu-tini sh -c 'sleep 10'

and ctrl-C it, nothing happens: SIGINT is sent to the 'sh' process, but that shell won't react to it while it is waiting for the 'sleep' to finish.

With the

option, Tini kills the child process group , so that every process in the group gets the signal. This corresponds more closely to what happens when you do ctrl-C etc. in a terminal: The signal is sent to the foreground process group.

Parent Death Signal

Tini can set its parent death signal, which is the signal Tini should receive when its parent exits. To set the parent death signal, use the

flag with the name of the signal Tini should receive when its parent exits:
tini -p SIGTERM -- ...

NOTE: See this PR discussion to learn more about the parent death signal and use cases.


Existing Entrypoint

Tini can also be used with an existing entrypoint in your container!

Assuming your entrypoint was

, then you would use:
ENTRYPOINT ["/tini", "--", "/"]

Statically-Linked Version

Tini has very few dependencies (it only depends on libc), but if your container fails to start, you might want to consider using the statically-built version instead:

ADD${TINI_VERSION}/tini-static /tini

Size Considerations

Tini is a very small file (in the 10KB range), so it doesn't add much weight to your container.

The statically-linked version is bigger, but still < 1M.

Building Tini

If you'd rather not download the binary, you can build Tini by running

cmake . && make

Before building, you probably also want to run:


This ensure that even if you're building on a system that has old Linux Kernel headers (< 3.4), Tini will be built with child subreaper support. This is usually what you want if you're going to use Tini with Docker (if your host Kernel supports Docker, it should also support child subreapers).

Understanding Tini

After spawning your process, Tini will wait for signals and forward those to the child process, and periodically reap zombie processes that may be created within your container.

When the "first" child process exits (

in the examples above), Tini exits as well, with the exit code of the child process (so you can check your container's exit code to know whether the child exited successfully).


If something isn't working just like you expect, consider increasing the verbosity level (up to 3):

tini -v    -- bash -c 'exit 1'
tini -vv   -- true
tini -vvv  -- pwd




Special thanks to:

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