docker.dockerex.socat.markdown

dockerex

socat -d TCP-LISTEN:2376,range=127.0.0.1/32,reuseaddr,fork UNIX:/run/docker.sock &

# curl localhost:2376/containers/json
[{"Id":"47d8a2db2b0b64408f23e65d28e10a44d90b029b29b89b1427407bfddad8a61e","Names":["/objective_jepsen"],....

iex(10)> req_1="http+unix://" <> URI.encode_www_form("/run/docker.sock") <> "/containers/json"
"http+unix://%2Frun%2Fdocker.sock/containers/json"

iex(9)> HTTPoison.get req_1
{:ok,
 %HTTPoison.Response{body: "[{\"Id\":\"47d8a2db2b0b64408f23e65d28e10a44d90b029b29b89b1427407bfddad8a61e\",\"Names\":[\"/objective_jepsen\"],\"Image\":\"elixir\",\"ImageID\":\"sha256:97dbd18772c407993ca62b44a3526d925b57581125d53ee28871a73eee062c92\",\"Command\":\"/bin/bash\",\"Created\":1509120018,\"Ports\":[],\"Labels\":{},\"State\":\"running\",\"Status\":\"Up 23 minutes\",\"HostConfig\":{\"NetworkMode\":\"default\"},\"NetworkSettings\":{\"Networks\":{\"bridge\":{\"IPAMConfig\":null,\"Links\":null,\"Aliases\":null,\"NetworkID\":\"b0b7e48e35f3e101851a9a7f68709458f7c1f0d3fe956b68d02e01f5c5cc40ec\",\"EndpointID\":\"d32c2fb7294b4976a33242aff02974c74607a58f8f91354aaf7280fe4c1efda6\",\"Gateway\":\"172.17.0.1\",\"IPAddress\":\"172.17.0.2\",\"IPPrefixLen\":16,\"IPv6Gateway\":\"\",\"GlobalIPv6Address\":\"\",\"GlobalIPv6PrefixLen\":0,\"MacAddress\":\"02:42:ac:11:00:02\",\"DriverOpts\":null}}},\"Mounts\":[{\"Type\":\"bind\",\"Source\":\"/var/run/docker.sock\",\"Destination\":\"/var/run/docker.sock\",\"Mode\":\"\",\"RW\":true,\"Propagation\":\"rprivate\"},{\"Type\":\"bind\",\"Source\":\"/Users/bryanhunt/tmpdir\",\"Destination\":\"/foo\",\"Mode\":\"\",\"RW\":true,\"Propagation\":\"rprivate\"}]}]\n",
  headers: [{"Api-Version", "1.33"}, {"Content-Type", "application/json"},
   {"Docker-Experimental", "true"}, {"Ostype", "linux"},
   {"Server", "Docker/17.10.0-ce (linux)"},
   {"Date", "Fri, 27 Oct 2017 16:23:22 GMT"}, {"Content-Length", "1042"}],
  request_url: "http+unix://%2Frun%2Fdocker.sock/containers/json",
  status_code: 200}}

body = """
 {
    "AttachStdin": false,
     "AttachStdout": true,
    "AttachStderr": true,
    "DetachKeys": "ctrl-p,ctrl-q",
    "Tty": false,
    "Cmd": [ "date" ],
    "Env": [ "FOO=bar" ]
 }
"""

req_1="http+unix://" <> URI.encode_www_form("/run/docker.sock") <> "/containers/47d8a2db2b0b/exec"

HTTPoison.post(req_1,body)

{:ok,
 %HTTPoison.Response{body: "{\"message\":\"Content-Type specified (application/octet-stream) must be 'application/json'\"}\n",
  headers: [{"Api-Version", "1.33"}, {"Content-Type", "application/json"},
   {"Docker-Experimental", "true"}, {"Ostype", "linux"},
   {"Server", "Docker/17.10.0-ce (linux)"},
   {"Date", "Fri, 27 Oct 2017 16:35:49 GMT"}, {"Content-Length", "91"}],
  request_url: "http+unix://%2Frun%2Fdocker.sock/containers/47d8a2db2b0b/exec",
  status_code: 400}}

socat -v UNIX-LISTEN:/tmp/fake,fork UNIX-CONNECT:/var/run/docker.sock

-v : writes the traffic to stderr as text in addition to relaying instructions. Some conversions are made for the sake of readability so if certain sequences aren’t being interpreted properly, one could try -x (hex).
UNIX-LISTEN : listen for connections on the unix socket (In our case, /tmp/fake)
fork : create a separate subprocess for handling new connections so the main process may continue listening
UNIX-CONNECT : connect to the specified unix socket (In our case, /var/run/docker.sock)

Once that’s been started, it’s just a matter of ensuring your docker commands go through ‘unix:///tmp/fake’.

$ export DOCKER_HOST=unix:///tmp/fake