Using docker for unit test

Question

I run a MySQL container with --net=host option.

So now i can make unit test using:g:

self.db = MySQLdb.connect(host="127.0.0.1", user="XYZ", passwd="XYZ", db="TEST_DB")

The problem is when I try to dockerize my unit test, linking the container with my MySQL container, the 127.0.0.1 IP is not valid. I need to use the real ip for the MySql container, or use the DNS (/etc/hosts file).

So I need to alter the ip 127.0.0.1 for the name of the MySQL host.

I imagine that there is a better way to do this? I can, for example, alter the /etc/hosts file of my development enviroment.

Andy · Accepted Answer · 2015-10-29 13:02:59Z

1

Docker links update the /etc/hosts file in the linked containers.

Use the name of the container you have linked to (find it in the /etc/hosts file) to reference the database in your tests.

self.db = MySQLdb.connect(host="db-container-name", user="XYZ", passwd="XYZ", db="TEST_DB")

docker-compose will also do this for you (it's just a wrapper for Docker and uses links underneath), or you can use the --add-host flag to manually add an entry to a container's /etc/hosts file as per this:

$ docker run -it --add-host db-static:86.75.30.9 ubuntu cat /etc/hosts
172.17.0.22     09d03f76bf2c
fe00::0         ip6-localnet
ff00::0         ip6-mcastprefix
ff02::1         ip6-allnodes
ff02::2         ip6-allrouters
127.0.0.1       localhost
::1             localhost ip6-localhost ip6-loopback
86.75.30.9      db-static

answered Oct 29, 2015 at 13:02

Andy

17.8k9 gold badges55 silver badges70 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

p.magalhaes Over a year ago

Thanks! But how can I use it on my development envrimoment. I need to connect to this container on my enviroment. What host do i use? I run docker run --name=XYZ --net=host xpto/xpto, and the try to connect using XYZ. If i put XYZ on my hosts file, it works. Is it the best practice?

p.magalhaes Over a year ago

Ok! I will try to put --add-host. I read it again, and it alter the hosts file of the container.

Collectives™ on Stack Overflow

Using docker for unit test

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related