Tweak initial mysql my.cnf settings to lower memory usage in 5.7.

install/installvars.pm.in

@@ -328,6 +328,7 @@ $MYSQLDUMP		= "/usr/local/bin/mysqldump";
 $MYSQLINSTALL		= "/usr/local/bin/mysql_install_db";
 $MYSQLDBDIR		= "/var/db/mysql";
 $MYSQL_LOGDIR		= "$LOGDIR/mysql";
+$MYSQL_CNF		= "/usr/local/etc/mysql/my.cnf";
 
 $PROTOUSER		= "elabman";
 $CHECKUPUSER		= "elabckup";

install/phases/boss/database

@@ -31,6 +31,28 @@ sub Install($$$)
 		}
 	    }
 	};
+	#
+	# Keep the memory usage down:
+	#
+	#   innodb_buffer_pool_size: 1G -> 128M
+	#   innodb_data_file_path: 128M -> 16M
+	#   innodb_temp_data_file_path: 128M -> 48M
+	#   performance_schema: ON -> OFF
+	#
+	# XXX will need to revisit this when we start using innodb tables.
+	#
+	Phase "config", "Tweak my.cnf", sub {
+	    PhaseSkip("unneeded")
+		if (!$newmysql);
+	    DoneIfDoesntExist($MYSQL_CNF);
+	    AppendToFileFatal($MYSQL_CNF,
+			"[mysqld]",
+			"innodb_buffer_pool_size    = 128M",
+			"innodb_data_file_path      = ibdata1:16M:autoextend",
+			"innodb_temp_data_file_path = ibtmp1:48M:autoextend",
+			"performance_schema         = OFF"
+	    );
+	};
 	Phase "initialize", "Initializing mysql", sub {
 	    PhaseSkip("mysqld already initialzed")
 		if (-d "$MYSQLDBDIR/mysql");

install/phases/ops/database

@@ -35,6 +35,29 @@ sub Install($$$)
 	    }
 	};
 
+	#
+	# Keep the memory usage down:
+	#
+	#   innodb_buffer_pool_size: 1G -> 128M
+	#   innodb_data_file_path: 128M -> 16M
+	#   innodb_temp_data_file_path: 128M -> 48M
+	#   performance_schema: ON -> OFF
+	#
+	# XXX will need to revisit this when we start using innodb tables.
+	#
+	Phase "config", "Tweak my.cnf", sub {
+	    PhaseSkip("unneeded")
+		if (!$newmysql);
+	    DoneIfDoesntExist($MYSQL_CNF);
+	    AppendToFileFatal($MYSQL_CNF,
+			"[mysqld]",
+			"innodb_buffer_pool_size    = 128M",
+			"innodb_data_file_path      = ibdata1:16M:autoextend",
+			"innodb_temp_data_file_path = ibtmp1:48M:autoextend",
+			"performance_schema         = OFF"
+	    );
+	};
+
 	# Get a password for the the DB.
 	Phase "password", "Asking for mysqld root password", sub {
 	    DoneIfExists("$ETCDIR/mysqld.pwd");