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, use the @keepstore -never-delete=true@ flag or remove the @-commit-trash@ flag from your keep-balance startup script.
13 {% include 'notebox_end' %}
15 h2. Install keep-balance
17 Keep-balance can be installed anywhere with access to Keep services. Typically it runs on the same host as keepproxy.
19 On Debian-based systems:
22 <pre><code>~$ <span class="userinput">sudo apt-get install keep-balance</span>
26 On Red Hat-based systems:
29 <pre><code>~$ <span class="userinput">sudo yum install keep-balance</span>
33 Verify that @keep-balance@ is functional:
36 <pre><code>~$ <span class="userinput">keep-balance -h</span>
38 Usage: keep-balance [options]
42 send pull requests (make more replicas of blocks that are underreplicated or are not in optimal rendezvous probe order)
44 send trash requests (delete unreferenced old blocks, and excess replicas of overreplicated blocks)
49 h3. Create a keep-balance token
51 Create a privileged Arvados API token for use by keep-balance. *On the API server*, run:
54 <pre><code>apiserver:~$ <span class="userinput">cd /var/www/arvados-api/current</span>
55 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>
56 zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
60 h3. Create a configuration file
62 Create @/etc/arvados/keep-balance/keep-balance.yml@ using the token you generated in the previous step. Follow this YAML format:
66 APIHost: <span class="userinput">uuid_prefix.your.domain</span>:443
67 AuthToken: zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
71 CollectionBatchSize: 100000
72 CollectionBuffers: 1000
76 If your API server's SSL certificate is not signed by a recognized CA, add the @Insecure@ option to the @Client@ section:
80 <span class="userinput">Insecure: true</span>
85 h3. Start the service (option 1: systemd)
87 If your system does not use systemd, skip this section and follow the "runit instructions":#runit instead.
89 If your system uses systemd, the keep-balance service should already be set up. Start it and check its status:
92 <pre><code>~$ <span class="userinput">sudo systemctl restart keep-balance</span>
93 ~$ <span class="userinput">sudo systemctl status keep-balance</span>
94 ● keep-balance.service - Arvados Keep Balance
95 Loaded: loaded (/lib/systemd/system/keep-balance.service; enabled)
96 Active: active (running) since Sat 2017-02-14 18:46:01 UTC; 3 days ago
97 Docs: https://doc.arvados.org/
98 Main PID: 541 (keep-balance)
99 CGroup: /system.slice/keep-balance.service
100 └─541 /usr/bin/keep-balance -commit-pulls -commit-trash
102 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
103 Feb 14 18:56:01 zzzzz.arvadosapi.com keep-balance[541]: 2017/02/14 18:56:01 Run: start
104 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"
105 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
109 h3(#runit). Start the service (option 2: runit)
111 Install runit to supervise the keep-balance daemon. {% include 'install_runit' %}
113 Create a supervised service.
116 <pre><code>~$ <span class="userinput">sudo mkdir /etc/service/keep-balance</span>
117 ~$ <span class="userinput">cd /etc/service/keep-balance</span>
118 ~$ <span class="userinput">sudo mkdir log log/main</span>
119 ~$ <span class="userinput">printf '#!/bin/sh\nexec keep-balance -commit-pulls -commit-trash 2>&1\n' | sudo tee run</span>
120 ~$ <span class="userinput">printf '#!/bin/sh\nexec svlogd main\n' | sudo tee log/run</span>
121 ~$ <span class="userinput">sudo chmod +x run log/run</span>
122 ~$ <span class="userinput">sudo sv exit .</span>
123 ~$ <span class="userinput">cd -</span>
127 Use @sv stat@ and check the log file to verify the service is running.
130 <pre><code>~$ <span class="userinput">sudo sv stat /etc/service/keep-balance</span>
131 run: /etc/service/keep-balance: (pid 12520) 2s; run: log: (pid 12519) 2s
132 ~$ <span class="userinput">tail /etc/service/keep-balance/log/main/current</span>
133 2017/02/14 18:46:01 starting up: will scan every 10m0s and on SIGUSR1
134 2017/02/14 18:56:01 Run: start
135 2017/02/14 18:56:01 skipping zzzzz-bi6l4-rbtrws2jxul6i4t with service type "proxy"
136 2017/02/14 18:56:01 clearing existing trash lists, in case the new rendezvous order differs from previous run
140 h2. Enable delete operations on keepstore volumes
142 Ensure your keepstore services have the "delete" operation enabled. Otherwise, even when unneeded data is identified by keep-balance, it will never be deleted from the underlying storage devices.
144 Either use the @EnableDelete@ flag in your YAML configuration file @/etc/arvados/keepstore/keepstore.yml@:
148 BlobSigningKeyFile: /etc/keepstore/blob-signing.key
149 <span class="userinput">EnableDelete: true</span>
155 Or use the @-never-delete=false@ command line flag in your run script:
158 <pre><code>keepstore <span class="userinput">-never-delete=false</span> -volume=...