more docs

README.md

@@ -9,25 +9,20 @@ Now hosted on https://coverage.seattlecommunitynetwork.org/
 To install this service, the fist time, you will need to:
 
 1. Required tools and versions:
-    1. node
-    2. npm
+    1. Install `node` and `npm` according to the directions at https://nodejs.org/en/download/package-manager 
+    2. Install `pm2` using: `npm install pm2 -g` (as per https://www.npmjs.com/package/pm2#installing-pm2)
 2. Configure:
-    1. x
-    2. y
-    3. z
+    1. Edit `src/utils/config.ts` and set the correct URL for your API host (if you're testing or you're deploying to a new URL).
 3. Deploy as below.
 
-* What tools are needed and how are they installed?
-* What configuration is needed?
-* How is configuration set?
-
 
 ## Deploying
 Once the service has been setup (as above), it can be deployed using the following process:
 1. Login to the <coverage-host>
 2. Pull the lastest version from github
 3. Restart the server
 
+The shell commands are:
 ```
 ssh <coverage-host>
 cd ccn-coverage-vis
@@ -43,28 +38,57 @@ When a problem occurs, there are several checks to determine where the failure i
 3. Confirm nginx is operating as expected
 
 ### Checking HTTP errors in the browser
+First, open your browser and go to: https://coverage.seattlecommunitynetwork.org/
+
+Is it working?
+
+If not, open up the browser **Web Developer Tools**, usually under the menu Tools > Developer Tools > Web Developer Tools.
+
+With this panel open at the bottom of the screen select the **Network** tab and refresh the browser page.
 
+Look in the first column, Status:
+* 200: Ok
+* 502: Error with the backend services (behind nginx)
+* 500 errors: problem with nxginx. Look in `/var/log/nginx/error.log` for details.
+* 400 errors: problem with the service. Check the service logs and nginx logs.
+* Timeout or unreachable error: Something is broken in the network between your web browser and the coverage-vis host.
 
 
 ### Checking ccn-coverage-vis with pm2
+Next, confirm ccn-coverage-vis is operating as expected. To do this, you will need to be able to log into the server hosting the coverage service.
 
+Use `pm2 list` to confirm the "Vis Server" is **online**
 ```
 ssh <coverage-host>
 pm2 list
-# expect "API" in the list, expect running, screenshot
 ```
+![Online services under PM2](pm2-running-services.png "Online services under PM2")
 
-
-Running? check pm2
+If the "Vis Server" is not online as expected, restart it with:
+```
+pm2 restart Vis Server
+```
 
 
 ### Checking nginx
+If there appear problems with nginx, then check that the 
 
-Check service operation
+Check service operation:
+```
+systemctl status nginx
+```
 
-Check nginx logs
+Check nginx logs:
+```
+sudo tail /var/log/nginx/error.log
+```
 
+Sources of errors might include nginx configuration in `/etc/nginx/conf.d/01-ccn-coverage.conf`
 
+If you need to restart nginx, use: 
+```
+sudo systemctl restart nginx
+```
 
 ## Testing