Update error log file analysis

Author: jmrenouard

INTERNALS.md

@@ -6,6 +6,7 @@
 * [Get login information steps](#mysqltuner-get-login-information-steps)
 * [System checks](#mysqltuner-system-checks)
 * [Server version checks](#mysqltuner-server-version-checks)
+* [Error log file checks](#mysql-error-log-file-analysis)
 * [MySQL Storage engine general information](#mysql-storage-engine-general-information)
 * [Security checks](#mysqltuner-security-checks)
 * [CVE checks](#mysqltuner-cve-checks)
@@ -39,6 +40,7 @@
 * Get information about the tuning connexion
 * Check current MySQL version
 * Suggest 64-bit upgrade
+* Analyze mysqld error log file
 * Show enabled storage engines
 * Show informations about databases (option: --dbstat)
 * Show informations about indexes (option: --idxstat)
@@ -87,6 +89,13 @@
 * Currently MySQL < 5.1 are EOF considered.
 * Using 5.5+ version of MySQL for performance issue (asynchronous IO).
 
+## Mysql error log file analysis
+* Look for potential current error log file name
+* Check permission on error log file
+* Check size on error log file
+* Check error and warning on error log file
+* Find last start and shutdown on error log file
+
 ## MySQL Storage engine general information
 
 * Get storage engine counts/stats
@@ -215,7 +224,7 @@
    * MySQL needs 1 instance per 1Go of Buffer Pool
    * innodb_buffer_pool instances = round(innodb_buffer_pool_size / 1Go)
    * innodb_buffer_pool instances must be equals or lower than 64
-   
+
    - A bug in MySQL 5.6 causes SHOW VARIABLES to report an innodb_buffer_pool_instances value of 8 when innodb_buffer_pool_size is less than 1GB and only one buffer pool instance is present (Bug #18343670).
 
 * InnoDB Buffer Pool Usage

README.md

@@ -125,7 +125,7 @@ You can follow this command to create a new database sys containing very useful
 	cd mariadb-sys-master/
 	mysql -u root -p < ./sys_10.sql
 
-Errors & solutions for performance schema
+Errors & solutions for performance schema installation
 
      ERROR at line 21: Failed to open file './tables/sys_config_data_10.sql -- ported', error: 2
      Have a look at #452 solution given by @ericx

mysqltuner.pl

@@ -1197,12 +1197,36 @@ sub get_log_file_real_path {
     if ( -f "$file" ) {
         return $file;
     }
+    elsif ( -f "$hostname.log" ) {
+        return "$hostname.log";
+    }
     elsif ( -f "$hostname.err" ) {
         return "$hostname.err";
     }
-    elsif ( $datadir ne "" ) {
+    elsif ( -f "$datadir$hostname.err" ) {
         return "$datadir$hostname.err";
     }
+    elsif ( -f "$datadir$hostname.log" ) {
+        return "$datadir$hostname.log";
+    }
+    elsif ( -f "$datadir"."mysql_error.log" ) {
+        return "$datadir"."mysql_error.log";
+    }
+     elsif ( -f "/var/log/mysql.log" ) {
+        return "/var/log/mysql.log";
+    }
+    elsif ( -f "/var/log/mysqld.log" ) {
+        return "/var/log/mysqld.log";
+    }
+    elsif ( -f "/var/log/mysql/$hostname.err" ) {
+        return "/var/log/mysql/$hostname.err";
+    }
+    elsif ( -f "/var/log/mysql/$hostname.log" ) {
+        return "/var/log/mysql/$hostname.log";
+    }
+    elsif ( -f "/var/log/mysql/"."mysql_error.log" ) {
+        return "/var/log/mysql/"."mysql_error.log";
+    }
     else {
         return $file;
     }
@@ -1212,16 +1236,19 @@ sub log_file_recommendations {
     $myvar{'log_error'} =
       get_log_file_real_path( $myvar{'log_error'}, $myvar{'hostname'},
         $myvar{'datadir'} );
+
     subheaderprint "Log file Recommendations";
-    infoprint "Log file: "
-      . $myvar{'log_error'} . "("
-      . hr_bytes_rnd( ( stat $myvar{'log_error'} )[7] ) . ")";
     if ( -f "$myvar{'log_error'}" ) {
         goodprint "Log file $myvar{'log_error'} exists";
     }
     else {
         badprint "Log file $myvar{'log_error'} doesn't exist";
+        return;
     }
+    infoprint "Log file: "
+      . $myvar{'log_error'} . "("
+      . hr_bytes_rnd( ( stat $myvar{'log_error'} )[7] ) . ")";
+
     if ( -r "$myvar{'log_error'}" ) {
         goodprint "Log file $myvar{'log_error'} is readable.";
     }