title: Get docker API engine exec output
body: <p>I try to get the output from a command Im running inside a container, but I only get it in RAW text so far. I need to be able to get the output with PHP, seems like I cant do that when it returns in RAW text.</p>
  
  <p>Here is my Dockerfile:</p>
  
  <pre><code>FROM phusion/baseimage:0.9.19
  
  CMD ["/sbin/my_init"]
  
  WORKDIR /root
  
  RUN sed -i "s/^exit 101$/exit 0/" /usr/sbin/policy-rc.d
  
  RUN apt-get update
  RUN DEBIAN_FRONTEND="noninteractive" apt-get install -y \
      nginx \
      php-fpm php-mysql php-gd php-curl php-cli php-mbstring php-dom unzip
  
  RUN service php7.0-fpm start
  
  EXPOSE 80
  
  RUN apt-get clean &amp;&amp; rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
  </code></pre>
  
  <p>And here is the curl requests Im running:</p>
  
  <pre><code>## Create container
  curl --unix-socket /var/run/docker.sock -H "Content-Type: application/json" -d '{"Image":"test-container","Env":["VIRTUAL_HOST=test.domain.dev"]}' -X POST http:/v1.27/containers/create?name=test.domain.dev
  
  ## Start container
  curl --unix-socket /var/run/docker.sock -H "Content-Type: application/json" -X POST http:/v1.27/containers/test.domain.dev/start
  
  ## Create exec instance
  curl --unix-socket /var/run/docker.sock -H "Content-Type: application/json" -d '{ "AttachStdin":false,"AttachStdout":true,"AttachStderr":true, "Tty":false, "Cmd":["/bin/bash", "-c", "date"] }' -X POST http:/v1.27/containers/test.domain.dev/exec
  
  ## Start exec instance
  curl --unix-socket /var/run/docker.sock -H "Content-Type: application/json" -d '{ "Detach": false, "Tty": false }' -X POST http:/v1.27/exec/bcd34186a9a7360809cace3674fec03bd1c70c1c453be24ad058a03fa0b0e960/start
  
  // Sun Mar 26 23:23:53 UTC 2017
  </code></pre>
  
  <p>Output from <code>docker info</code>:</p>
  
  <pre><code>Containers: 8
  Running: 4
  Paused: 0
  Stopped: 4
  Images: 152
  Server Version: 17.03.0-ce
  Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Native Overlay Diff: true
  Logging Driver: json-file
  Cgroup Driver: cgroupfs
  Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Swarm: inactive
  Runtimes: runc
  Default Runtime: runc
  Init Binary: docker-init
  containerd version: 977c511eda0925a723debdc94d09459af49d082a
  runc version: a01dafd48bc1c7cc12bdb01206f9fea7dd6feb70
  init version: 949e6fa
  Security Options:
  seccomp
  Profile: default
  Kernel Version: 4.9.12-moby
  Operating System: Alpine Linux v3.5
  OSType: linux
  Architecture: x86_64
  CPUs: 2
  Total Memory: 1.952 GiB
  Name: moby
  ID: JNZW:S7LC:4JRG:M3K3:6EFV:RZNR:Q7T5:XNJA:LB2Z:PO5G:PGPX:RI2E
  Docker Root Dir: /var/lib/docker
  Debug Mode (client): false
  Debug Mode (server): true
  File Descriptors: 43
  Goroutines: 81
  System Time: 2017-03-26T23:25:45.809302866Z
  EventsListeners: 2
  No Proxy: *.local, 169.254/16
  Registry: https://index.docker.io/v1/
  Experimental: true
  Insecure Registries:
  127.0.0.0/8
  Live Restore Enabled: false
  </code></pre>
  
  <p>So, is there any proper way to get this output? Thanks for any help </p>