Category: Operating Systems

Linux , Windows and Macintosh Operating Systems

PHP scripts not running after upgrading from php 5.6 to php 7

Issue:  After upgrading from php5.6 to php 7.2  website is down .     Upgrading from php 5 to php 7 on centos  may require small changes in httpd (apache2) configuration files . Error could be related to loading php7 module  and error may display something like  Starting httpd: httpd: Syntax error on line 221 […]

Knowing why server was shutdown

Sometimes we may want to investigate why a linux system was shutdown unexpectedly .  As you know already , the only place we get this information from is /var/log directory . last -x  command will display some information about shutdown/reboot like below . runlevel (to lvl 3)   2.6.32-754.17.1. Sat Sep  7 16:24 – 18:41  […]

http 503 service unavailable on SharePoint

Error: http 503 service unavailable Whenever I see this error message on share point site, first I look at status of Application pool . If it is disabled/stopped then I look at windows event-viewer log . There were couple of warning messages followed by an error message in event viewer . Warning Message 1: Event […]

Install Windows Java based desktop application on Mac

If you are using Mac and have some windows desktop application which is java run time environment dependent ,you have few choices for running it on a Macintosh . 1 .dual boot with windows by using bootcamp. You will see good performance with this solution as the entire system resources are spared for windows operating […]

Disable Elasticsearch listening on ipv6

By default elastic search is listening on ipv6 and not ipv4 when installed . We can make it listen on on ipv4 by adding this line _non_loopback:ipv4_ to /etc/elasticsearch/elasticsearch.yml configuration file . Or we can disable ipv6 at Operating system level by adding below lines to /etc/sysctl.conf file net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 […]

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