3 navsection: installguide
4 title: Install the websocket server
7 Copyright (C) The Arvados Authors. All rights reserved.
9 SPDX-License-Identifier: CC-BY-SA-3.0
12 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/ws for additional information.
14 By convention, we use the following hostname for the websocket service.
17 <pre><code>ws.<span class="userinput">uuid_prefix.your.domain</span></code></pre>
20 The above hostname should resolve from anywhere on the internet.
22 h2. Install arvados-ws
24 Typically arvados-ws runs on the same host as the API server.
26 On Debian-based systems:
29 <pre><code>~$ <span class="userinput">sudo apt-get install arvados-ws</span>
33 On Red Hat-based systems:
36 <pre><code>~$ <span class="userinput">sudo yum install arvados-ws</span>
40 Verify that @arvados-ws@ is functional:
43 <pre><code>~$ <span class="userinput">arvados-ws -h</span>
46 path to config file (default "/etc/arvados/ws/ws.yml")
48 show current configuration and exit
52 h3. Create a configuration file
54 Create @/etc/arvados/ws/ws.yml@ using the following template. Replace @xxxxxxxx@ with the "password you generated during database setup":install-postgresql.html#api.
58 APIHost: <span class="userinput">uuid_prefix.your.domain</span>:443
59 Listen: ":<span class="userinput">9003</span>"
61 dbname: arvados_production
63 password: <span class="userinput">xxxxxxxx</span>
68 h3. Start the service (option 1: systemd)
70 If your system does not use systemd, skip this section and follow the "runit instructions":#runit instead.
72 If your system uses systemd, the arvados-ws service should already be set up. Start it and check its status:
75 <pre><code>~$ <span class="userinput">sudo systemctl restart arvados-ws</span>
76 ~$ <span class="userinput">sudo systemctl status arvados-ws</span>
77 ● arvados-ws.service - Arvados websocket server
78 Loaded: loaded (/lib/systemd/system/arvados-ws.service; enabled)
79 Active: active (running) since Tue 2016-12-06 11:20:48 EST; 10s ago
80 Docs: https://doc.arvados.org/
81 Main PID: 9421 (arvados-ws)
82 CGroup: /system.slice/arvados-ws.service
83 └─9421 /usr/bin/arvados-ws
85 Dec 06 11:20:48 zzzzz arvados-ws[9421]: {"level":"info","msg":"started","time":"2016-12-06T11:20:48.207617188-05:00"}
86 Dec 06 11:20:48 zzzzz arvados-ws[9421]: {"Listen":":9003","level":"info","msg":"listening","time":"2016-12-06T11:20:48.244956506-05:00"}
87 Dec 06 11:20:48 zzzzz systemd[1]: Started Arvados websocket server.
91 If it is not running, use @journalctl@ to check logs for errors:
94 <pre><code>~$ <span class="userinput">sudo journalctl -n10 -u arvados-ws</span>
96 Dec 06 11:12:48 zzzzz systemd[1]: Starting Arvados websocket server...
97 Dec 06 11:12:48 zzzzz arvados-ws[8918]: {"level":"info","msg":"started","time":"2016-12-06T11:12:48.030496636-05:00"}
98 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"}
102 Skip ahead to "confirm the service is working":#confirm.
104 h3(#runit). Start the service (option 2: runit)
106 Install runit to supervise the arvados-ws daemon. {% include 'install_runit' %}
108 Create a supervised service.
111 <pre><code>~$ <span class="userinput">sudo mkdir /etc/service/arvados-ws</span>
112 ~$ <span class="userinput">cd /etc/service/arvados-ws</span>
113 ~$ <span class="userinput">sudo mkdir log log/main</span>
114 ~$ <span class="userinput">printf '#!/bin/sh\nexec arvados-ws 2>&1\n' | sudo tee run</span>
115 ~$ <span class="userinput">printf '#!/bin/sh\nexec svlogd main\n' | sudo tee log/run</span>
116 ~$ <span class="userinput">sudo chmod +x run log/run</span>
117 ~$ <span class="userinput">sudo sv exit .</span>
118 ~$ <span class="userinput">cd -</span>
122 Use @sv stat@ and check the log file to verify the service is running.
125 <pre><code>~$ <span class="userinput">sudo sv stat /etc/service/arvados-ws</span>
126 run: /etc/service/arvados-ws: (pid 12520) 2s; run: log: (pid 12519) 2s
127 ~$ <span class="userinput">tail /etc/service/arvados-ws/log/main/current</span>
128 {"level":"info","msg":"started","time":"2016-12-06T11:56:20.669171449-05:00"}
129 {"Listen":":9003","level":"info","msg":"listening","time":"2016-12-06T11:56:20.708847627-05:00"}
133 h3(#confirm). Confirm the service is working
135 Confirm the service is listening on its assigned port and responding to requests.
138 <pre><code>~$ <span class="userinput">curl http://0.0.0.0:<b>9003</b>/status.json</span>
143 h3. Set up a reverse proxy with SSL support
145 The arvados-ws service will be accessible from anywhere on the internet, so we recommend using SSL for transport encryption.
147 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).
149 For example, using Nginx:
152 upstream arvados-ws {
153 server 127.0.0.1:<span class="userinput">9003</span>;
157 listen <span class="userinput">[your public IP address]</span>:443 ssl;
158 server_name ws.<span class="userinput">uuid_prefix.your.domain</span>;
160 proxy_connect_timeout 90s;
161 proxy_read_timeout 300s;
164 ssl_certificate <span class="userinput"/>YOUR/PATH/TO/cert.pem</span>;
165 ssl_certificate_key <span class="userinput"/>YOUR/PATH/TO/cert.key</span>;
168 proxy_pass http://arvados-ws;
169 proxy_set_header Upgrade $http_upgrade;
170 proxy_set_header Connection "upgrade";
171 proxy_set_header Host $host;
172 proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
177 {% include 'notebox_begin' %}
178 If you are upgrading a cluster where Nginx is configured to proxy @ws@ requests to puma, change the @server_name@ value in the old configuration block so it doesn't conflict. When the new configuration is working, delete the old Nginx configuration sections (i.e., the "upstream websockets" block, and the "server" block that references @http://websockets@), and disable/remove the runit or systemd files for the puma server.
179 {% include 'notebox_end' %}
181 h3. Update API server configuration
183 Ensure the websocket server address is correct in the API server configuration file @/etc/arvados/api/application.yml@.
186 <pre><code>websocket_address: wss://ws.<span class="userinput">uuid_prefix.your.domain</span>/websocket
190 Restart Nginx to reload the API server configuration.
193 <pre><code>$ sudo nginx -s reload</span>
197 h3. Verify DNS and proxy setup
199 Use a host elsewhere on the Internet to confirm that your DNS, proxy, and SSL are configured correctly.
202 <pre><code>$ <span class="userinput">curl https://ws.<b>uuid_prefix.your.domain</b>/status.json</span>