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README.md

Creating Certificates for Docker

Warning

These certificates are only meant for integration tests on CI environments (like circleCI). Do not use them for any real machine. Since all keys are publicly available anybody could gain root access to your machine.

1. Create the certificate files

There is an excellent guide on the official docker homepage. This document contains the log on how the certificates in this folder were created. It differs slightly form the official guide.

  • Certificates are valid for 10 years instead of 1 year.
  • Certificates use v3_req extension to support both 127.0.0.1 and localhost (see config file server-cert.txt).
$ cd ~

$ mkdir .docker

$ cd .docker

$ echo 01 > ca.srl

$ openssl genrsa -des3 -out ca-key.pem 2048
Generating RSA private key, 2048 bit long modulus
............................................+++
..................+++
e is 65537 (0x10001)
Enter pass phrase for ca-key.pem: docker-java
Verifying - Enter pass phrase for ca-key.pem: docker-java

$ openssl req -new -x509 -days 3650 -key ca-key.pem -out ca.pem
Enter pass phrase for ca-key.pem: docker-java
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [AU]:
State or Province Name (full name) [Some-State]:
Locality Name (eg, city) []:
Organization Name (eg, company) [Internet Widgits Pty Ltd]: docker-java
Organizational Unit Name (eg, section) []:
Common Name (e.g. server FQDN or YOUR name) []:
Email Address []:

$ openssl genrsa -des3 -out server-key.pem 2048
Generating RSA private key, 2048 bit long modulus
..........+++
.........+++
e is 65537 (0x10001)
Enter pass phrase for server-key.pem: docker-java
Verifying - Enter pass phrase for server-key.pem: docker-java

$ openssl req -new -key server-key.pem -out server.csr -config server-cert.txt
Enter pass phrase for server-key.pem: docker-java
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
TypeCommonNameHere []: localhost

$ openssl x509 -req -days 3650 -in server.csr -CA ca.pem -CAkey ca-key.pem -out server-cert.pem -extensions v3_req -extfile server-cert.txt
Signature ok
subject=/CN=localhost
Getting CA Private Key
Enter pass phrase for ca-key.pem: docker-java

$ openssl genrsa -des3 -out key.pem 2048
Generating RSA private key, 2048 bit long modulus
............................................+++
.......................................................+++
e is 65537 (0x10001)
Enter pass phrase for key.pem: docker-java
Verifying - Enter pass phrase for key.pem: docker-java

$ openssl req -subj '/CN=client' -new -key key.pem -out client.csr
Enter pass phrase for key.pem: docker-java

$ echo extendedKeyUsage = clientAuth > extfile.cnf

$ openssl x509 -req -days 3650 -in client.csr -CA ca.pem -CAkey ca-key.pem -out cert.pem -extfile extfile.cnf
Signature ok
subject=/CN=client
Getting CA Private Key
Enter pass phrase for ca-key.pem: docker-java

$ openssl rsa -in server-key.pem -out server-key.pem
Enter pass phrase for server-key.pem: docker-java
writing RSA key

$ openssl rsa -in key.pem -out key.pem
Enter pass phrase for key.pem: docker-java
writing RSA key

Once you created all the files you can have a look at their content with the following command

openssl x509 -in <some-file>.pem -inform pem -noout -text

2. Configuring the docker daemon

On linux the docker daemon allows to specify options in the file /etc/default/docker. By adding the following line (or modifying an existing line) one can get the docker daemon to listen on both unix socket and https.

DOCKER_OPTS="-H unix:///var/run/docker.sock -H tcp://127.0.0.1:2376 --tlsverify --tlscacert=~/.docker/ca.pem --tlscert=~/.docker/server-cert.pem --tlskey=~/.docker/server-key.pem"

3. Restart the daemon and test the setup

After changing the daemon options it must be restarted

$ sudo service docker restart

To test the socket and the https connection:

$ docker -H tcp://127.0.0.1:2376 --tlsverify version
Client version: 1.4.1
Client API version: 1.16
Go version (client): go1.3.3
Git commit (client): 5bc2ff8
OS/Arch (client): linux/amd64
Server version: 1.4.1
Server API version: 1.16
Go version (server): go1.3.3
Git commit (server): 5bc2ff8

$ docker -H unix:///var/run/docker.sock version
Client version: 1.4.1
Client API version: 1.16
Go version (client): go1.3.3
Git commit (client): 5bc2ff8
OS/Arch (client): linux/amd64
Server version: 1.4.1
Server API version: 1.16
Go version (server): go1.3.3
Git commit (server): 5bc2ff8
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