Add "%%IMAGE%%" and use it in HAProxy

This commit is contained in:
Tianon Gravi 2017-05-11 15:21:18 -07:00
parent a8da955681
commit 88f4c65633
2 changed files with 9 additions and 6 deletions

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@ -14,12 +14,12 @@ Please refer to [upstream's excellent (and comprehensive) documentation](https:/
It is also worth checking out the [`examples/` directory from upstream](http://www.haproxy.org/git?p=haproxy-1.7.git;a=tree;f=examples).
Note: Many configuration examples propose to put `daemon` into the `global` section to run haproxy as daemon. Do **not** configure this or the Docker container will exit immediately after launching because the haproxy process would go into the background.
Note: Many configuration examples propose to put `daemon` into the `global` section to run HAProxy as daemon. Do **not** configure this or the Docker container will exit immediately after launching because the HAProxy process would go into the background.
## Create a `Dockerfile`
```dockerfile
FROM haproxy:1.7
FROM %%IMAGE%%:1.7
COPY haproxy.cfg /usr/local/etc/haproxy/haproxy.cfg
```
@ -41,22 +41,22 @@ $ docker run -it --rm --name haproxy-syntax-check my-haproxy haproxy -c -f /usr/
$ docker run -d --name my-running-haproxy my-haproxy
```
You may need to publish the ports your haproxy is listening on to the host by specifying the -p option, for example -p 8080:80 to publish port 8080 from the container host to port 80 in the container. Make sure the port you're using is free.
You may need to publish the ports your HAProxy is listening on to the host by specifying the -p option, for example -p 8080:80 to publish port 8080 from the container host to port 80 in the container. Make sure the port you're using is free.
## Directly via bind mount
```console
$ docker run -d --name my-running-haproxy -v /path/to/etc/haproxy:/usr/local/etc/haproxy:ro haproxy:1.7
$ docker run -d --name my-running-haproxy -v /path/to/etc/haproxy:/usr/local/etc/haproxy:ro %%IMAGE%%:1.7
```
Note that your host's `/path/to/etc/haproxy` folder should be populated with a file named `haproxy.cfg`. If this configuration file refers to any other files within that folder then you should ensure that they also exist (e.g. template files such as `400.http`, `404.http`, and so forth). However, many minimal configurations do not require any supporting files.
### Reloading config
If you used a bind mount for the config and have edited your `haproxy.cfg` file, you can use haproxy's graceful reload feature by sending a `SIGHUP` to the container:
If you used a bind mount for the config and have edited your `haproxy.cfg` file, you can use HAProxy's graceful reload feature by sending a `SIGHUP` to the container:
```console
$ docker kill -s HUP my-running-haproxy
```
The entrypoint script in the image checks for running the command `haproxy` and replaces it with `haproxy-systemd-wrapper` from haproxy upstream which takes care of signal handling to do the graceful reload. Under the hood this uses the `-sf` option of haproxy so "there are two small windows of a few milliseconds each where it is possible that a few connection failures will be noticed during high loads" (see [Stopping and restarting HAProxy](http://www.haproxy.org/download/1.7/doc/management.txt)).
The entrypoint script in the image checks for running the command `haproxy` and replaces it with `haproxy-systemd-wrapper` from HAProxy upstream which takes care of signal handling to do the graceful reload. Under the hood this uses the `-sf` option of `haproxy` so "there are two small windows of a few milliseconds each where it is possible that a few connection failures will be noticed during high loads" (see [Stopping and restarting HAProxy](http://www.haproxy.org/download/1.7/doc/management.txt)).

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@ -115,6 +115,9 @@ for image in "${images[@]}"; do
echo ' MAINTAINER => "'"$maintainer"'"'
replace_field "$targetFile" 'MAINTAINER' "$maintainer"
echo ' IMAGE => "'"$image"'"'
replace_field "$targetFile" 'IMAGE' "$image"
echo ' REPO => "'"$repo"'"'
replace_field "$targetFile" 'REPO' "$repo"