3 navsection: installguide
4 title: Install the websocket server
7 {% include 'notebox_begin_warning' %}
9 This websocket server is an alternative to the puma server that comes with the API server. It is available as an *experimental pre-release* and is not recommended for production sites.
11 {% include 'notebox_end' %}
13 The arvados-ws server provides event notifications to websocket clients. It can be installed anywhere with access to Postgres database and the Arvados API server, typically behind a web proxy that provides SSL support. See the "godoc page":http://godoc.org/github.com/curoverse/arvados/services/keep-web for additional information.
15 By convention, we use the following hostname for the websocket service.
18 <pre><code>ws.<span class="userinput">uuid_prefix.your.domain</span></code></pre>
21 The above hostname should resolve from anywhere on the internet.
23 h2. Install arvados-ws
25 Typically arvados-ws runs on the same host as the API server.
27 On Debian-based systems:
30 <pre><code>~$ <span class="userinput">sudo apt-get install arvados-ws</span>
34 On Red Hat-based systems:
37 <pre><code>~$ <span class="userinput">sudo yum install arvados-ws</span>
41 Verify that @arvados-ws@ is functional:
44 <pre><code>~$ <span class="userinput">arvados-ws -h</span>
47 path to config file (default "/etc/arvados/ws/ws.yml")
49 show current configuration and exit
53 h3. Create a configuration file
55 Create @/etc/arvados/ws/ws.yml@ using the following template. Replace @xxxxxxxx@ with the "password you generated during database setup":install-postgresql.html#api.
59 APIHost: <span class="userinput">uuid_prefix.your.domain</span>:443
60 Listen: ":<span class="userinput">9003</span>"
62 dbname: arvados_production
64 password: <span class="userinput">xxxxxxxx</span>
69 h3. Start the service (option 1: systemd)
71 If your system does not use systemd, skip this section and follow the "runit instructions":#runit instead.
73 If your system uses systemd, the arvados-ws service should already be set up. Start it and check its status:
76 <pre><code>~$ <span class="userinput">sudo systemctl restart arvados-ws</span>
77 ~$ <span class="userinput">sudo systemctl status arvados-ws</span>
78 ● arvados-ws.service - Arvados websocket server
79 Loaded: loaded (/lib/systemd/system/arvados-ws.service; enabled)
80 Active: active (running) since Tue 2016-12-06 11:20:48 EST; 10s ago
81 Docs: https://doc.arvados.org/
82 Main PID: 9421 (arvados-ws)
83 CGroup: /system.slice/arvados-ws.service
84 └─9421 /usr/bin/arvados-ws
86 Dec 06 11:20:48 zzzzz arvados-ws[9421]: {"level":"info","msg":"started","time":"2016-12-06T11:20:48.207617188-05:00"}
87 Dec 06 11:20:48 zzzzz arvados-ws[9421]: {"Listen":":9003","level":"info","msg":"listening","time":"2016-12-06T11:20:48.244956506-05:00"}
88 Dec 06 11:20:48 zzzzz systemd[1]: Started Arvados websocket server.
92 If it is not running, use @journalctl@ to check logs for errors:
95 <pre><code>~$ <span class="userinput">sudo journalctl -n10 -u arvados-ws</span>
97 Dec 06 11:12:48 zzzzz systemd[1]: Starting Arvados websocket server...
98 Dec 06 11:12:48 zzzzz arvados-ws[8918]: {"level":"info","msg":"started","time":"2016-12-06T11:12:48.030496636-05:00"}
99 Dec 06 11:12:48 zzzzz arvados-ws[8918]: {"error":"pq: password authentication failed for user \"arvados\"","level":"fatal","msg":"db.Ping failed","time":"2016-12-06T11:12:48.058206400-05:00"}
103 Skip ahead to "confirm the service is working":#confirm.
105 h3(#runit). Start the service (option 2: runit)
107 Install runit to supervise the arvados-ws daemon. {% include 'install_runit' %}
109 Create a supervised service.
112 <pre><code>~$ <span class="userinput">sudo mkdir /etc/service/arvados-ws</span>
113 ~$ <span class="userinput">cd /etc/service/arvados-ws</span>
114 ~$ <span class="userinput">sudo mkdir log log/main</span>
115 ~$ <span class="userinput">printf '#!/bin/sh\nexec arvados-ws 2>&1\n' | sudo tee run</span>
116 ~$ <span class="userinput">printf '#!/bin/sh\nexec svlogd main\n' | sudo tee log/run</span>
117 ~$ <span class="userinput">sudo chmod +x run log/run</span>
118 ~$ <span class="userinput">sudo sv exit .</span>
119 ~$ <span class="userinput">cd -</span>
123 Use @sv stat@ and check the log file to verify the service is running.
126 <pre><code>~$ <span class="userinput">sudo sv stat /etc/service/arvados-ws</span>
127 run: /etc/service/arvados-ws: (pid 12520) 2s; run: log: (pid 12519) 2s
128 ~$ <span class="userinput">tail /etc/service/arvados-ws/log/main/current</span>
129 {"level":"info","msg":"started","time":"2016-12-06T11:56:20.669171449-05:00"}
130 {"Listen":":9003","level":"info","msg":"listening","time":"2016-12-06T11:56:20.708847627-05:00"}
134 h3(#confirm). Confirm the service is working
136 Confirm the service is listening on its assigned port and responding to requests.
139 <pre><code>~$ <span class="userinput">curl http://0.0.0.0:<b>9003</b>/status.json</span>
144 h3. Set up a reverse proxy with SSL support
146 The arvados-ws service will be accessible from anywhere on the internet, so we recommend using SSL for transport encryption.
148 This is best achieved by putting a reverse proxy with SSL support in front of arvados-ws, running on port 443 and passing requests to arvados-ws on port 9003 (or whatever port you chose in your configuration file).
150 For example, using Nginx:
153 upstream arvados-ws {
154 server 127.0.0.1:<span class="userinput">9003</span>;
158 listen <span class="userinput">[your public IP address]</span>:443 ssl;
159 server_name ws.<span class="userinput">uuid_prefix.your.domain</span>;
161 proxy_connect_timeout 90s;
162 proxy_read_timeout 300s;
165 ssl_certificate <span class="userinput"/>YOUR/PATH/TO/cert.pem</span>;
166 ssl_certificate_key <span class="userinput"/>YOUR/PATH/TO/cert.key</span>;
169 proxy_pass http://arvados-ws;
170 proxy_set_header Upgrade $http_upgrade;
171 proxy_set_header Connection "upgrade";
172 proxy_set_header Host $host;
173 proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
178 If Nginx is already configured to proxy @ws@ requests to puma, move that configuration out of the way or change its @server_name@ so it doesn't conflict.
180 h3. Update API server configuration
182 Ensure the websocket server address is correct in the API server configuration file @/etc/arvados/api/application.yml@.
185 <pre><code>websocket_address: wss://ws.<span class="userinput">uuid_prefix.your.domain</span>/websocket
189 Restart Nginx to reload the API server configuration.
192 <pre><code>$ sudo nginx -s reload</span>
196 h3. Verify DNS and proxy setup
198 Use a host elsewhere on the Internet to confirm that your DNS, proxy, and SSL are configured correctly.
201 <pre><code>$ <span class="userinput">curl https://ws.<b>uuid_prefix.your.domain</b>/status.json</span>