4 title: "Customizing Crunch environment using Docker"
7 This page describes how to customize the runtime environment (e.g. the programs, libraries, and other dependencies needed to run a job) that a crunch script will be run in using "Docker.":https://www.docker.com/ Docker is a tool for building and running containers that isolate applications from other applications running on the same node. For detailed information about Docker, see the "Docker User Guide.":https://docs.docker.com/userguide/
9 This page will demonstrate how to:
11 # Fetch the arvados/jobs Docker image
12 # Manually install additional software into the container
13 # Create a new custom image
14 # Upload that image to Arvados for use by Crunch jobs
15 # Share your image with others
17 {% include 'tutorial_expectations' %}
19 You also need ensure that "Docker is installed,":https://docs.docker.com/installation/ the Docker daemon is running, and you have permission to access Docker. You can test this by running @docker version@. If you receive a permission denied error, your user account may need to be added to the @docker@ group. If you have root access, you can add yourself to the @docker@ group using @$ sudo addgroup $USER docker@ then log out and log back in again; otherwise consult your local sysadmin.
21 h2. Fetch a starting image
23 The easiest way to begin is to start from the "arvados/jobs" image which already has the Arvados SDK installed along with other configuration required for use with Crunch.
25 Download the latest "arvados/jobs" image from the Docker registry:
28 <pre><code>$ <span class="userinput">docker pull arvados/jobs</span>
29 Pulling repository arvados/jobs
30 3132168f2acb: Download complete
31 a42b7f2c59b6: Download complete
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48 h2. Install new packages
50 Next, enter the container using @docker run@, providing the arvados/jobs image and the program you want to run (in this case the bash shell).
53 <pre><code>$ <span class="userinput">docker run --interactive --tty --user root arvados/jobs /bin/bash</span>
58 Next, update the package list using @apt-get update@.
61 <pre><code>root@a0e8299b59aa:/# <span class="userinput">apt-get update</span>
62 Get:1 http://apt.arvados.org wheezy Release.gpg [490 B]
63 Get:2 http://apt.arvados.org wheezy Release [1568 B]
64 Get:3 http://apt.arvados.org wheezy/main amd64 Packages [34.6 kB]
65 Get:4 http://ftp.us.debian.org wheezy Release.gpg [1655 B]
66 Get:5 http://ftp.us.debian.org wheezy-updates Release.gpg [836 B]
67 Get:6 http://ftp.us.debian.org wheezy Release [168 kB]
68 Ign http://apt.arvados.org wheezy/main Translation-en
69 Get:7 http://security.debian.org wheezy/updates Release.gpg [836 B]
70 Get:8 http://security.debian.org wheezy/updates Release [102 kB]
71 Get:9 http://ftp.us.debian.org wheezy-updates Release [124 kB]
72 Get:10 http://ftp.us.debian.org wheezy/main amd64 Packages [5841 kB]
73 Get:11 http://security.debian.org wheezy/updates/main amd64 Packages [218 kB]
74 Get:12 http://security.debian.org wheezy/updates/main Translation-en [123 kB]
75 Hit http://ftp.us.debian.org wheezy/main Translation-en
76 Hit http://ftp.us.debian.org wheezy-updates/main amd64 Packages/DiffIndex
77 Hit http://ftp.us.debian.org wheezy-updates/main Translation-en/DiffIndex
78 Fetched 6617 kB in 5s (1209 kB/s)
79 Reading package lists... Done
83 In this example, we will install the "R" statistical language Debian package "r-base-core". Use @apt-get install@:
86 <pre><code>root@a0e8299b59aa:/# <span class="userinput">apt-get install r-base-core</span>
87 Reading package lists... Done
88 Building dependency tree
89 Reading state information... Done
90 The following extra packages will be installed:
92 libxv1 libxxf86dga1 libxxf86vm1 r-base-core r-base-dev r-base-html r-cran-boot r-cran-class r-cran-cluster r-cran-codetools
96 The following NEW packages will be installed:
98 libxv1 libxxf86dga1 libxxf86vm1 r-base r-base-core r-base-dev r-base-html r-cran-boot r-cran-class r-cran-cluster
100 0 upgraded, 107 newly installed, 0 to remove and 9 not upgraded.
101 Need to get 88.2 MB of archives.
102 After this operation, 219 MB of additional disk space will be used.
103 Do you want to continue [Y/n]? y
105 Get:85 http://ftp.us.debian.org/debian/ wheezy/main r-base-core amd64 2.15.1-4 [20.6 MB]
106 Get:86 http://ftp.us.debian.org/debian/ wheezy/main r-base-dev all 2.15.1-4 [3882 B]
107 Get:87 http://ftp.us.debian.org/debian/ wheezy/main r-cran-boot all 1.3-5-1 [472 kB]
109 Fetched 88.2 MB in 2min 17s (642 kB/s)
110 Extracting templates from packages: 100%
111 Preconfiguring packages ...
113 Unpacking r-base-core (from .../r-base-core_2.15.1-4_amd64.deb) ...
114 Selecting previously unselected package r-base-dev.
115 Unpacking r-base-dev (from .../r-base-dev_2.15.1-4_all.deb) ...
116 Selecting previously unselected package r-cran-boot.
117 Unpacking r-cran-boot (from .../r-cran-boot_1.3-5-1_all.deb) ...
119 Setting up r-base-core (2.15.1-4) ...
120 Setting R_PAPERSIZE_USER default to 'a4'
122 Creating config file /etc/R/Renviron with new version
123 Setting up r-base-dev (2.15.1-4) ...
124 Setting up r-cran-boot (1.3-5-1) ...
129 Now we can verify that "R" is installed:
132 <pre><code>root@a0e8299b59aa:/# <span class="userinput">R</span>
134 R version 2.15.1 (2012-06-22) -- "Roasted Marshmallows"
135 Copyright (C) 2012 The R Foundation for Statistical Computing
137 Platform: x86_64-pc-linux-gnu (64-bit)
139 R is free software and comes with ABSOLUTELY NO WARRANTY.
140 You are welcome to redistribute it under certain conditions.
141 Type 'license()' or 'licence()' for distribution details.
143 R is a collaborative project with many contributors.
144 Type 'contributors()' for more information and
145 'citation()' on how to cite R or R packages in publications.
147 Type 'demo()' for some demos, 'help()' for on-line help, or
148 'help.start()' for an HTML browser interface to help.
149 Type 'q()' to quit R.
155 Note that you are not limited to installing Debian packages. You may compile programs or libraries from source and install them, edit systemwide configuration files, use other package managers such as @pip@ or @gem@, and perform any other customization necessary to run your program.
157 h2. Create a new image
159 We're now ready to create a new Docker image. First, quit the container, then use @docker commit@ to create a new image from the stopped container. The container id can be found in the default hostname of the container displayed in the prompt, in this case @a0e8299b59aa@:
162 <pre><code>root@a0e8299b59aa:/# <span class="userinput">exit</span>
163 $ <span class="userinput">docker commit a0e8299b59aa arvados/jobs-with-r</span>
164 33ea6b87792364cb9989a149c36a31e5a9c8cf96694ba05f66545ad7b842522e
165 $ <span class="userinput">docker images</span>
166 REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
167 arvados/jobs-with-r latest 33ea6b877923 43 seconds ago 1.607 GB
168 arvados/jobs latest 3132168f2acb 22 hours ago 1.314 GB
172 h2. Upload your image
174 Finally, we are ready to upload the new Docker image to Arvados. Use @arv keep docker@ with the image repository name to upload the image. Without arguments, @arv keep docker@ will print out the list of Docker images in Arvados that are available to you.
177 <pre><code>$ <span class="userinput">arv keep docker arvados/jobs-with-r</span>
179 Collection saved as 'Docker image arvados/jobs-with-r:latest 33ea6b877923'
180 qr1hi-4zz18-3fk2px2ji25nst2
181 $ <span class="userinput">arv keep docker</span>
182 REPOSITORY TAG IMAGE ID COLLECTION CREATED
183 arvados/jobs-with-r latest 33ea6b877923 qr1hi-4zz18-3fk2px2ji25nst2 Thu Oct 16 13:58:53 2014
187 You are now able to specify the runtime environment for your program using the @docker_image@ field of the @runtime_constaints@ section of your pipeline components:
190 {% code 'example_docker' as javascript %}
193 * The @docker_image@ field can be one of: the Docker repository name (as shown above), the Docker image hash, the Arvados collection UUID, or the Arvados collection portable data hash.
195 h2. Share Docker images
197 Docker images are subject to normal Arvados permissions. If wish to share your Docker image with others (or wish to share a pipeline template that uses your Docker image) you will need to use @arv keep docker@ with the @--project-uuid@ option to upload the image to a shared project.
200 <pre><code>$ <span class="userinput">arv keep docker --project-uuid zzzzz-j7d0g-u7zg1qdaowykd8d arvados/jobs-with-r</span>