No alive nodes. All the 1 nodes seem to be down

 

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I had the same problem. Everything worked fine from python but it always gave this error from the php code. Then google around let me to following article where a person had similar problem

https://github.com/elastic/elasticsearch-php/issues/1120

And the helper finally pointed him that your httpd need to be allowed to connect to the network and following solution page was referenced:

CURL permission denied via browser, works on ssh

The solution mentioned was to add following line in the php.ini file

setsebool -P httpd_can_network_connect 1

However, for me it worked when I executed this command with sudo on the command line.

Hope it works for you as well