CentOS 6.7 Connection Issues with Docker behind a firewall

Please disregard my incorrect spaces in the links and URLs. I don’t have the reputation needed to post > 2 urls or 2 links.

I have a new installation of CentOS 6.7 as shown with the uname -a command below:

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  • Linux 2.6.32-573.7.1.el6.x86_64 #1 SMP Tue Sep 22 22:00:00 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

    This machine is behind a corporate firewall.

    I have installed docker-io. The version information is (docker version):

    Client version: 1.7.1
    Client API version: 1.19
    Go version (client): go1.4.2
    Git commit (client): 786b29d/1.7.1
    OS/Arch (client): linux/amd64
    Server version: 1.7.1
    Server API version: 1.19
    Go version (server): go1.4.2
    Git commit (server): 786b29d/1.7.1
    OS/Arch (server): linux/amd64

    The docker service is running:

    docker (pid 2593) is running…

    When I run
    sudo docker pull hello-world
    I get the error:
    Get https : //index.docker.io/v1/repositories/library/hello-world/images: dial tcp connection timed out

    When I run
    sudo docker run hello-world
    I get a similar error:
    Get https : //index.docker.io/v1/repositories/library/hello-world/images: dial tcp connection timed out

    I can browse to the URL
    https : //index.docker.io/v1/repositories/library/hello-world/images in Firefox (after I put in my userid/password for the proxy). I get:

    [{“checksum”: “”, “id”: “3f12c794407e68e515ba7f473a744e748ac8a827a2ea8b33855dec564238b2e5”}, {“checksum”: “”, “id”: “975b84d108f1024953937167506c2935a081c8c55ae9e9f7b7deee118605367f”}, {“checksum”: “”, “id”: “535020c3e8add9d6bb06e5ac15a261e73d9b213d62fb2c14d752b8e189b2b912”}, {“checksum”: “”, “id”: “af340544ed62de0680f441c71fa1a80cb084678fed42bae393e543faea3a572c”}, {“checksum”: “”, “id”: “a8219747be10611d65b7c693f48e7222c0bf54b5df8467d3f99003611afa1fd8”}, {“checksum”: “”, “id”: “91c95931e552b11604fea91c2f537284149ec32fff0f700a4769cfd31d7696ae”}, {“checksum”: “”, “id”: “e45a5af57b00862e5ef5782a9925979a02ba2b12dff832fd0991335f4a11e5c5”}, {“checksum”: “”, “id”: “31cbccb51277105ba3ae35ce33c22b69c9e3f1002e76e4c736a2e8ebff9d7b5d”}, {“checksum”: “”, “id”: “ef872312fe1bbc5e05aae626791a47ee9b032efa8f3bda39cc0be7b56bfe59b9”}, {“checksum”: “”, “id”: “7fa0dcdc88de9c8a856f648c1f8e0cf8141a505bbddb7ecc0c61f1ed5e086852”}, {“checksum”: “”, “id”: “bf16b6e27882c0790071c95326e0186eccd2b8ac2bd5ef34fecdbb332a90926e”}, {“checksum”: “”, “id”: “8f5550346e6173730dca712d1fc87e671ae04d5899d6c4290f7897c054b2318e”}, {“checksum”: “”, “id”: “f86750113cd23609d504342d39015d5c7f218935b8420dd43b79cd99f4f93960”}, {“checksum”: “”, “id”: “0a1b1cfaa9a2153fdabe163d562fe1321a5c1d1db3a59e0fac7c65f966bc38a9”}, {“checksum”: “”, “id”: “511136ea3c5a64f264b78b5433614aec563103b4d4702f3ba7d4d2698e22c158”}, {“checksum”: “”, “id”: “2505d942a91db2045278f9d5c58067414d367c02506bbba96f0769a6ac6ad47b”}, {“checksum”: “”, “id”: “565a9d68a73f6706862bfe8409a7f659776d4d60a8d096eb4a3cbce6999cc2a1”}]

    curl www.google.com and curl http://www.google.com work correctly.

    When I run:
    curl -v https://index.docker.io:443

    I get the following:
    * About to connect() to index.docker.io port 443 (#0)
    * Trying… Connection timed out
    * Trying… Connection timed out
    * Trying… Connection timed out
    * couldn’t connect to host
    * Closing connection #0
    curl: (7) couldn’t connect to host

    I have tried the docker run and docker pull with and without the http_proxy and https_proxy information in a /etc/default/docker file based on another post on Stack Overflow. Originally, there was not a /etc/default/docker file available after the docker-io install. This did not help.
    Contents of the /etc/default/docker file shown below:
    http_proxy=http : //proxyName:port
    https_proxy=http : //proxyName:port

    I also tried (in the /etc/default/docker file):
    export http_proxy=http : //proxyName:port
    export https_proxy=http : //proxyName:port

    I have been googling all day today in an effort to resolve this issue and haven’t made any progress.

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  • One Solution collect form web for “CentOS 6.7 Connection Issues with Docker behind a firewall”

    Your problem is your corporate firewall. This may not be solvable as your company requires you to login with a username and password – you can download the image using firefox which I imagine is negotiating the proxy for you using LDAP or whatever.

    You can try setting http_proxy and https_proxy variables in your shell which may work depending on the proxy

    $ export http_proxy=http://server-ip:port/
    $ export http_proxy=
    $ export http_proxy=http://proxy-server.mycorp.com:3128/


    The chances are your company is minimising having any badly behaved code arriving inside their network so you probably shouldn’t circumvent that and talk to your IT department

    Docker will be the best open platform for developers and sysadmins to build, ship, and run distributed applications.