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update haproxy README.md

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Signed-off-by: Gong Sophia <sophia.gong@intel.com>
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Gong Sophia
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haproxy
==========
This provides a Clear Linux* haproxy instance.
# Clear Linux* OS `haproxy` container image
Build
-----
docker build -t clearlinux/haproxy .
<!-- Required -->
## What is this image?
Or just pull it from Dockerhub
---------------------------
docker pull clearlinux/haproxy
`clearlinux/haproxy` is a Docker image with `haproxy` running on top of the
[official clearlinux base image](https://hub.docker.com/_/clearlinux).
start a haproxy instance
-----------------------
docker run --name some-haproxy -d -p 8080:80 clearlinux/haproxy
<!-- application introduction -->
> [Haproxy](http://www.haproxy.org/) is a free, very fast and reliable solution offering
> high availability, load balancing, and proxying for TCP and HTTP-based applications.
use customized configuration file
---------------------
Since no two users of haproxy are likely to configure it exactly alike, we provide /usr/local/etc/haproxy/haproxy.cfg as an example, user may need to customize their own and override this default. Please refer to [page](https://cbonte.github.io/haproxy-dconv/) for configure details.
For other Clear Linux* OS
based container images, see: https://hub.docker.com/u/clearlinux
Details of how-to
---------------------
Please refer to the docker official haproxy image [page](https://hub.docker.com/_/haproxy).
## Why use a clearlinux based image?
Extra Build ARGs
----------------
- ``swupd_args`` Specifies [SWUPD](https://github.com/clearlinux/swupd-client/blob/master/docs/swupd.1.rst#options) flags
<!-- CL introduction -->
> [Clear Linux* OS](https://clearlinux.org/) is an open source, rolling release
> Linux distribution optimized for performance and security, from the Cloud to
> the Edge, designed for customization, and manageability.
Default build args in Docker are on: https://docs.docker.com/engine/reference/builder/#arg
Clear Linux* OS based container images use:
* Optimized libraries that are compiled with latest compiler versions and
flags.
* Software packages that follow upstream source closely and update frequently.
* An aggressive security model and best practices for CVE patching.
* A multi-staged build approach to keep a reduced container image size.
* The same container syntax as the official images to make getting started
easy.
To learn more about Clear Linux* OS, visit: https://clearlinux.org.
<!-- Required -->
## Deployment:
### Deploy with Docker
The easiest way to get started with this image is by simply pulling it from
Docker Hub.
*Note: This container uses the same syntax as the [official haproxy
image](https://hub.docker.com/_/haproxy).
1. Pull the image from Docker Hub:
```
docker pull clearlinux/haproxy
```
2. Start a container using the examples below:
```
docker run --name some-haproxy -d -p 8080:80 clearlinux/haproxy
```
<!-- Optional -->
### Deploy with Kubernetes
<!-- Required -->
## Build and modify:
The Dockerfiles for all Clear Linux* OS based container images are available at
https://github.com/clearlinux/dockerfiles. These can be used to build and
modify the container images.
1. Clone the clearlinux/dockerfiles repository.
```
git clone https://github.com/clearlinux/dockerfiles.git
```
2. Change to the directory of the application:
```
cd haproxy/
```
3. Build the container image:
```
docker build -t clearlinux/haproxy .
```
Refer to the Docker documentation for [default build
arguments](https://docs.docker.com/engine/reference/builder/#arg).
Additionally:
- `swupd_args` - specifies arguments to pass to the Clear Linux* OS software
manager. See the [swupd man
pages](https://github.com/clearlinux/swupd-client/blob/master/docs/swupd.1.rst#options)
for more information.
<!-- Required -->
## Licenses
All licenses for the Clear Linux* Project and distributed software can be found
at https://clearlinux.org/terms-and-policies