3 navsection: installguide
4 title: Install Keep-balance
7 Keep-balance deletes unreferenced and overreplicated blocks from Keep servers, makes additional copies of underreplicated blocks, and moves blocks into optimal locations as needed (e.g., after adding new servers).
9 {% include 'notebox_begin' %}
11 If you are installing keep-balance on an existing system with valuable data, you can run keep-balance in "dry run" mode first and review its logs as a precaution. To do this, edit your keep-balance startup script to use the flags @-commit-pulls=false -commit-trash=false@.
13 {% include 'notebox_end' %}
15 h2. Install keep-balance
17 Keep-balance can be installed anywhere with network access to Keep services. Typically it runs on the same host as keepproxy.
19 *A cluster should have only one keep-balance process running at a time.*
21 On Debian-based systems:
24 <pre><code>~$ <span class="userinput">sudo apt-get install keep-balance</span>
28 On Red Hat-based systems:
31 <pre><code>~$ <span class="userinput">sudo yum install keep-balance</span>
35 Verify that @keep-balance@ is functional:
38 <pre><code>~$ <span class="userinput">keep-balance -h</span>
40 Usage: keep-balance [options]
44 send pull requests (make more replicas of blocks that are underreplicated or are not in optimal rendezvous probe order)
46 send trash requests (delete unreferenced old blocks, and excess replicas of overreplicated blocks)
51 h3. Create a keep-balance token
53 Create an Arvados superuser token for use by keep-balance. *On the API server*, run:
56 <pre><code>apiserver:~$ <span class="userinput">cd /var/www/arvados-api/current</span>
57 apiserver:/var/www/arvados-api/current$ <span class="userinput">sudo -u <b>webserver-user</b> RAILS_ENV=production bundle exec script/create_superuser_token.rb</span>
58 zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
62 h3. Update keepstore configuration files
64 On each node that runs keepstore, save the token you generated in the previous step in a text file like @/etc/arvados/keepstore/system-auth-token.txt@ and then create or update @/etc/arvados/keepstore/keepstore.yml@ with the following key:
67 <pre><code>SystemAuthTokenFile: /etc/arvados/keepstore/system-auth-token.txt
71 Restart all keepstore services to apply the updated configuration.
73 h3. Create a keep-balance configuration file
75 On the host running keep-balance, create @/etc/arvados/keep-balance/keep-balance.yml@ using the token you generated above. Follow this YAML format:
79 APIHost: <span class="userinput">uuid_prefix.your.domain</span>:443
80 AuthToken: zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
84 CollectionBatchSize: 100000
85 CollectionBuffers: 1000
89 If your API server's SSL certificate is not signed by a recognized CA, add the @Insecure@ option to the @Client@ section:
93 <span class="userinput">Insecure: true</span>
98 h3. Start the service (option 1: systemd)
100 If your system does not use systemd, skip this section and follow the "runit instructions":#runit instead.
102 If your system uses systemd, the keep-balance service should already be set up. Start it and check its status:
105 <pre><code>~$ <span class="userinput">sudo systemctl restart keep-balance</span>
106 ~$ <span class="userinput">sudo systemctl status keep-balance</span>
107 ● keep-balance.service - Arvados Keep Balance
108 Loaded: loaded (/lib/systemd/system/keep-balance.service; enabled)
109 Active: active (running) since Sat 2017-02-14 18:46:01 UTC; 3 days ago
110 Docs: https://doc.arvados.org/
111 Main PID: 541 (keep-balance)
112 CGroup: /system.slice/keep-balance.service
113 └─541 /usr/bin/keep-balance -commit-pulls -commit-trash
115 Feb 14 18:46:01 zzzzz.arvadosapi.com keep-balance[541]: 2017/02/14 18:46:01 starting up: will scan every 10m0s and on SIGUSR1
116 Feb 14 18:56:01 zzzzz.arvadosapi.com keep-balance[541]: 2017/02/14 18:56:01 Run: start
117 Feb 14 18:56:01 zzzzz.arvadosapi.com keep-balance[541]: 2017/02/14 18:56:01 skipping zzzzz-bi6l4-rbtrws2jxul6i4t with service type "proxy"
118 Feb 14 18:56:01 zzzzz.arvadosapi.com keep-balance[541]: 2017/02/14 18:56:01 clearing existing trash lists, in case the new rendezvous order differs from previous run
122 h3(#runit). Start the service (option 2: runit)
124 Install runit to supervise the keep-balance daemon. {% include 'install_runit' %}
126 Create a supervised service.
129 <pre><code>~$ <span class="userinput">sudo mkdir /etc/service/keep-balance</span>
130 ~$ <span class="userinput">cd /etc/service/keep-balance</span>
131 ~$ <span class="userinput">sudo mkdir log log/main</span>
132 ~$ <span class="userinput">printf '#!/bin/sh\nexec keep-balance -commit-pulls -commit-trash 2>&1\n' | sudo tee run</span>
133 ~$ <span class="userinput">printf '#!/bin/sh\nexec svlogd main\n' | sudo tee log/run</span>
134 ~$ <span class="userinput">sudo chmod +x run log/run</span>
135 ~$ <span class="userinput">sudo sv exit .</span>
136 ~$ <span class="userinput">cd -</span>
140 Use @sv stat@ and check the log file to verify the service is running.
143 <pre><code>~$ <span class="userinput">sudo sv stat /etc/service/keep-balance</span>
144 run: /etc/service/keep-balance: (pid 12520) 2s; run: log: (pid 12519) 2s
145 ~$ <span class="userinput">tail /etc/service/keep-balance/log/main/current</span>
146 2017/02/14 18:46:01 starting up: will scan every 10m0s and on SIGUSR1
147 2017/02/14 18:56:01 Run: start
148 2017/02/14 18:56:01 skipping zzzzz-bi6l4-rbtrws2jxul6i4t with service type "proxy"
149 2017/02/14 18:56:01 clearing existing trash lists, in case the new rendezvous order differs from previous run
153 h2. Enable delete operations on keepstore volumes
155 Ensure your keepstore services have the "delete" operation enabled. If it is disabled (which is the default), unneeded blocks will be identified by keep-balance, but will never be deleted from the underlying storage devices.
157 Add the @-never-delete=false@ command line flag to your keepstore run script:
160 <pre><code>keepstore <span class="userinput">-never-delete=false</span> -volume=...
165 // To replace the above section when the keepstore page recommends YAML...
167 Use the @EnableDelete@ flag in your YAML configuration file @/etc/arvados/keepstore/keepstore.yml@:
171 BlobSigningKeyFile: /etc/keepstore/blob-signing.key
172 <span class="userinput">EnableDelete: true</span>