Error "Could not gather sufficient random data" with PHP 7.0-alpine

[jderusse]

When using the php:7.0-alpine

$ docker run --rm php:7.0-alpine php -r "random_int(0, 1);"

Fatal error: Uncaught Exception: Could not gather sufficient random data in Command line code:1
Stack trace:
#0 Command line code(1): random_int(0, 1)
#1 {main}
  thrown in Command line code on line 1

Whereas the same call to other version (like php 7.1-alpine or 7.0) works
$ docker run --rm php:7.1-alpine php -r "random_int(0, 1);"
$ docker run --rm php:7.0 php -r "random_int(0, 1);"

[jderusse]

I think this commit from @nikic may be related: php/php-src@14c72cc

[pravindahal]

Now the same issue has been introduced in 7.1 alpine variant too.

[yosifkit]

It looks like the fix is merged in php/php-src#2385, so it should be fixed on the next php release.

[StalkAlex]

Is there any other options than wait till next release? I guess it's not fast solution.

[herloct]

@pravindahal

Now the same issue has been introduced in 7.1 alpine variant too.

Me too, on 7.1.2 alpine.

It works fine on my laptop (ubuntu 16.04), but it throws Could not gather sufficient random data on my server (debian jessie).

But 7.1.1 alpine works fine on ubuntu n debian.

[jderusse]

I just upgraded the kernel of my CI server. It solves the issue

[StalkAlex]

@jderusse you mean docker host machine?

[jderusse]

yep

[herloct]

@jderusse

I just upgraded the kernel of my CI server. It solves the issue

Upgrading kernel from v3 to v4?

[francislavoie]

@StalkAlex I fixed it by specifying version the tag php:7.0.15-alpine to downgrade to 7.0.15 until 7.0.17 releases.

This bug came up when I was installing my stack with a customer, had to make a hotfix build 😢

[StalkAlex]

@francislavoie I did the same but for php 7.1.2, downgraded to 7.1.1. Thanks!