Unable to connect to MySQL 5.7 with unix socket

Hi Lalit, 

I was able to narrow down the issue to selinux in enforcing mode. You are unable to reproduce since I believe it's running on non selinux or permissive mode. But there is no denial errors.
ausearch -i -m avc -ts today
Please try the test with selinux in permissive and enforced mode.

Here is the simple script to test which is similar to xtrabackup calling perlDBI

#!/usr/bin/perl -w
use v5.10;
use DBI;
say "Perl MariaDB Connect Demo";
my $dsn = "DBI:mysql:database=andrewbackuptest;mysql_socket=/tmp/mysqld_andrewbackuptest_3510.sock ";
my $username = 'xaviea';
my $password = 'xaviea';

my %attr = ( PrintError=>0, RaiseError=>1);

my $dbh = DBI->connect($dsn,$username,$password, %attr);

say "Connected to the MySQL database.";

$dbh->disconnect();

[ tsa401:/root]# setenforce 0
[.tsa401:/root]# getenforce
Permissive

[ tsa401:/root]# perl dbconnect.pl
Perl MariaDB Connect Demo
Connected to the MySQL database.

------------------------

Next trying with Enforce mode

[ tsa401:/root]# getenforce
Enforcing

[ tsa401:/root]# perl dbconnect.pl
Perl MariaDB Connect Demo
DBI connect('database=andrewbackuptest;mysql_socket=/tmp/mysqld_andrewbackuptest_3510.sock','xaviea',...) failed: Can't co#!/usr/bin/perl -w
nnect to local MySQL server through socket '/tmp/mysqld_andrewbackuptest_3510.sock' (22) at dbconnect.pl line 11.

not reproduciable.

Hi

Not reproduciable in my test. Please post this issue on our forum.

https://forums.percona.com/categories/percona-xtrabackup

Test: