Error:: Knex:warning - Pool2 - Error: ResourceRequest aborted: Knex: Timeout acquiring a connection.

Issue Summary

Ghost crashed. Seeing this error:

Sep  9 03:53:47 digitalocean journal: Knex:warning - Pool2 - Error: ResourceRequest aborted: Knex: Timeout acquiring a connection.
Sep  9 03:54:12 digitalocean journal: 
Sep  9 03:54:12 digitalocean journal: ERROR: Knex: Timeout acquiring a connection. The pool is probably full. Are you missing a .transacting(trx) call? 
Sep  9 03:54:12 digitalocean journal: Rendering Error Page 
Sep  9 03:54:13 digitalocean journal: Ghost caught a processing error in the middleware layer. 
Sep  9 03:54:13 digitalocean journal: Error: Knex: Timeout acquiring a connection. The pool is probably full. Are you missing a .transacting(trx) call?
Sep  9 03:54:13 digitalocean journal:    at /usr/src/ghost/node_modules/knex/lib/runner.js:191:30
Sep  9 03:54:13 digitalocean journal:    at tryCatcher (/usr/src/ghost/node_modules/bluebird/js/release/util.js:16:23)
Sep  9 03:54:13 digitalocean journal:    at /usr/src/ghost/node_modules/bluebird/js/release/catch_filter.js:17:41
Sep  9 03:54:13 digitalocean journal:    at tryCatcher (/usr/src/ghost/node_modules/bluebird/js/release/util.js:16:23)
Sep  9 03:54:13 digitalocean journal:    at Promise._settlePromiseFromHandler (/usr/src/ghost/node_modules/bluebird/js/release/promise.js:504:31)
Sep  9 03:54:13 digitalocean journal:    at Promise._settlePromise (/usr/src/ghost/node_modules/bluebird/js/release/promise.js:561:18)
Sep  9 03:54:13 digitalocean journal:    at Promise._settlePromise0 (/usr/src/ghost/node_modules/bluebird/js/release/promise.js:606:10)
Sep  9 03:54:13 digitalocean journal:    at Promise._settlePromises (/usr/src/ghost/node_modules/bluebird/js/release/promise.js:681:18)
Sep  9 03:54:13 digitalocean journal:    at Async._drainQueue (/usr/src/ghost/node_modules/bluebird/js/release/async.js:138:16)
Sep  9 03:54:13 digitalocean journal:    at Async._drainQueues (/usr/src/ghost/node_modules/bluebird/js/release/async.js:148:10)
Sep  9 03:54:13 digitalocean journal:    at Immediate.Async.drainQueues [as _onImmediate] (/usr/src/ghost/node_modules/bluebird/js/release/async.js:17:14)
Sep  9 03:54:13 digitalocean journal:    at processImmediate [as _immediateCallback] (timers.js:383:17) 

After a couple of these my machine died with an OOM.

Steps to Reproduce

I can’t.

Technical details:

• Ghost Version: ghost:0.10.0 via docker image
• Node Version: v4.5.0
• Browser/OS: centos-release-7-2.1511.el7.centos.2.10.x86_64 on DigitialOcean
• Database: sqlite

[ErisDS]

Hey @discordianfish - at the time this issue was raised, knex was about to swap back from pool2 to generic-pool in knex@0.12. Therefore there was little point investigating an issue in pool2. I didn’t link any specific issue as the upgrade was coming due to a general malaise with pool2 and there were many, many open issues.

The switch over to knex@0.12 and generic-pool for Ghost happened in this PR: https://github.com/TryGhost/Ghost/commit/0ea814ea81f43b64fb91afe95ce571defc5aae99, and was released in Ghost 0.11.1. Therefore if you have upgraded to 0.11.4 your install should no longer be using pool2 or getting pool2 errors.

I have also outlined why our postgres support has always been sub-optimal and will be dropped in Ghost 1.0.

[pascalandy]

This is probably related with my Docker network. I’m running only one instance of MYSQL.