Issue
I'am try to setup an express service on gcloud standard app engine. I'would like to use memcache for session caching.
Did someone cann help me, how i connect the service to the memcache?
my Code is:
var session = require('express-session')
var MemcachedStore = require('connect-memcached')(session);
app.use(session({
secret: 'appengineFTW',
key: 'a_key',
resave: true,
store: new MemcachedStore({
hosts: [process.env.MEMCACHE_URL || '127.0.0.1:11211']
}),
saveUninitialized: false
}));
The MEMCACHE_URL in prod is set to memcache:11211
Err: connect ECONNREFUSED 127.0.0.1:11211
Solution
1.Create a server folder.
mkdir server
cd server
2.Copy the server.js
file into the folder
const express = require('express');
const session = require('express-session');
const cookieParser = require('cookie-parser');
const MemcachedStore = require('connect-memjs')(session);
const publicIp = require('public-ip');
const crypto = require('crypto');
// Environment variables are defined in app.yaml.
let MEMCACHE_URL = process.env.MEMCACHE_URL || '127.0.0.1:11211';
if (process.env.USE_GAE_MEMCACHE) {
MEMCACHE_URL = `${process.env.GAE_MEMCACHE_HOST}:${process.env.GAE_MEMCACHE_PORT}`;
}
const app = express();
app.enable('trust proxy');
app.use(cookieParser());
app.use(session({
secret: 'your-secret-here',
key: 'view:count',
proxy: 'true',
store: new MemcachedStore({
servers: [MEMCACHE_URL]
})
}));
app.get('/', (req, res, next) => {
// Discover requester's public IP address
publicIp.v4().then((ip) => {
const userIp = crypto.createHash('sha256').update(ip).digest('hex').substr(0, 7);
// This shows the hashed IP for each
res.write(`<div>${userIp}</div>`);
if (req.session.views) {
req.session.views += 1;
} else {
req.session.views = 1;
}
res.end(`Viewed <strong>${req.session.views}</strong> times.`);
}).catch(next);
});
const PORT = process.env.PORT || 8080;
app.listen(PORT, () => {
console.log('App listening on port %s', PORT);
console.log('Press Ctrl+C to quit.');
});
module.exports = app;
3.Create a package.json
file with NPM or Yarn:
npm init
4.Install dependencies with NPM or Yarn:
npm install --save connect-memjs cookie-parser express express-session public-ip
5.Create a memcached instance in the same region as your app engine application (gcloud app describe
to find the region). Write down the IP address of one of your nodes.
6.Create a app.yaml
file
runtime: nodejs
env: flex
env_variables:
MEMCACHE_URL: 10.10.10.10:11211 #your memcached instance ip
7.Deploy the application to App Engine Flex
gcloud app deploy gcloud app browse
- Visit
http://YOUR_PROJECT_ID.appspot.com
to see the deployed app.
Answered By - marian.vladoi Answer Checked By - Pedro (PHPFixing Volunteer)
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