Also there is a problem with update:

[root@centos-base ~]# yum update
Loaded plugins: auto-update-debuginfo, fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirror.bakinter.net
 * epel: epel.mirror.srv.co.ge
 * epel-debuginfo: epel.mirror.srv.co.ge
 * extras: mirror.bakinter.net
 * updates: mirror.bakinter.net
Resolving Dependencies
--> Running transaction check
---> Package Percona-Server-shared-55.x86_64 0:5.5.44-rel37.3.el7 will be obsoleting
---> Package Percona-Server-shared-56.x86_64 0:5.6.25-rel73.1.el7 will be obsoleting
---> Package Percona-XtraDB-Cluster-shared-55.x86_64 1:5.5.41-25.11.853.el7 will be obsoleting
---> Package Percona-XtraDB-Cluster-shared-56.x86_64 1:5.6.24-25.11.1.el7 will be obsoleting
---> Package mariadb-libs.x86_64 1:5.5.44-1.el7_1 will be obsoleted
--> Processing Dependency: mariadb-libs(x86-64) = 1:5.5.44-1.el7_1 for package: 1:mariadb-5.5.44-1.el7_1.x86_64
--> Processing Dependency: mariadb-libs(x86-64) = 1:5.5.44-1.el7_1 for package: 1:mariadb-server-5.5.44-1.el7_1.x86_64
--> Processing Conflict: 1:Percona-XtraDB-Cluster-shared-56-5.6.24-25.11.1.el7.x86_64 conflicts Percona-Server-shared-56
--> Processing Conflict: Percona-Server-shared-56-5.6.25-rel73.1.el7.x86_64 conflicts Percona-Server-shared-55
--> Processing Conflict: 1:Percona-XtraDB-Cluster-shared-55-5.5.41-25.11.853.el7.x86_64 conflicts Percona-XtraDB-Cluster-shared-56
--> Processing Conflict: 1:Percona-XtraDB-Cluster-shared-55-5.5.41-25.11.853.el7.x86_64 conflicts Percona-Server-shared-55
--> Processing Conflict: Percona-Server-shared-55-5.5.44-rel37.3.el7.x86_64 conflicts Percona-Server-shared-56
--> Finished Dependency Resolution
Error: Percona-Server-shared-55 conflicts with Percona-Server-shared-56-5.6.25-rel73.1.el7.x86_64
Error: Percona-XtraDB-Cluster-shared-55 conflicts with 1:Percona-XtraDB-Cluster-shared-56-5.6.24-25.11.1.el7.x86_64
Error: Package: 1:mariadb-5.5.44-1.el7_1.x86_64 (@updates)
           Requires: mariadb-libs(x86-64) = 1:5.5.44-1.el7_1
           Removing: 1:mariadb-libs-5.5.44-1.el7_1.x86_64 (@updates)
               mariadb-libs(x86-64) = 1:5.5.44-1.el7_1
           Obsoleted By: 1:Percona-XtraDB-Cluster-shared-56-5.6.24-25.11.1.el7.x86_64 (percona-release-x86_64)
               Not found
           Available: 1:mariadb-libs-5.5.41-2.el7_0.x86_64 (base)
               mariadb-libs(x86-64) = 1:5.5.41-2.el7_0
Error: Percona-XtraDB-Cluster-shared-56 conflicts with Percona-Server-shared-56-5.6.25-rel73.1.el7.x86_64
Error: Percona-XtraDB-Cluster-shared-55 conflicts with Percona-Server-shared-55-5.5.44-rel37.3.el7.x86_64
Error: Percona-Server-shared-56 conflicts with Percona-Server-shared-55-5.5.44-rel37.3.el7.x86_64
Error: Package: 1:mariadb-server-5.5.44-1.el7_1.x86_64 (@updates)
           Requires: mariadb-libs(x86-64) = 1:5.5.44-1.el7_1
           Removing: 1:mariadb-libs-5.5.44-1.el7_1.x86_64 (@updates)
               mariadb-libs(x86-64) = 1:5.5.44-1.el7_1
           Obsoleted By: 1:Percona-XtraDB-Cluster-shared-56-5.6.24-25.11.1.el7.x86_64 (percona-release-x86_64)
               Not found
           Available: 1:mariadb-libs-5.5.41-2.el7_0.x86_64 (base)
               mariadb-libs(x86-64) = 1:5.5.41-2.el7_0
 You could try using --skip-broken to work around the problem
 You could try running: rpm -Va --nofiles --nodigest