Added stack migrate command to migrate MySQL/Percona to MariaDB

ee/cli/plugins/stack.py

@@ -26,6 +26,7 @@ import pwd
 import grp
 import codecs
 from ee.cli.plugins.stack_services import EEStackStatusController
+from ee.cli.plugins.stack_migrate import EEStackMigrateController
 from ee.core.logging import Log
 
 
@@ -1523,6 +1524,7 @@ def load(app):
     # register the plugin class.. this only happens if the plugin is enabled
     handler.register(EEStackController)
     handler.register(EEStackStatusController)
+    handler.register(EEStackMigrateController)
 
     # register a hook (function) to run after arguments are parsed.
     hook.register('post_argument_parsing', ee_stack_hook)

ee/cli/plugins/stack_migrate.py

@@ -0,0 +1,99 @@
+from cement.core.controller import CementBaseController, expose
+from cement.core import handler, hook
+from ee.core.mysql import EEMysql
+from ee.core.logging import Log
+from ee.core.variables import EEVariables
+from ee.core.aptget import EEAptGet
+from ee.core.shellexec import EEShellExec
+from ee.core.apt_repo import EERepo
+import configparser
+import os
+
+
+class EEStackMigrateController(CementBaseController):
+    class Meta:
+        label = 'migrate'
+        stacked_on = 'stack'
+        stacked_type = 'nested'
+        description = ('Migrate stack safely')
+        arguments = [
+            (['--mariadb'],
+                dict(help="Migrate database to MariaDB",
+                     action='store_true')),
+            # (['--PHP'],
+            #    dict(help="update to html site", action='store_true')),
+            ]
+
+    @expose(hide=True)
+    def migrate_mariadb(self):
+        # Backup all database
+        EEMysql.backupAll(self)
+
+        # Add MariaDB repo
+        Log.info(self, "Adding repository for MariaDB, please wait ...")
+        EERepo.add(self, repo_url=EEVariables.ee_mysql_repo)
+        Log.debug(self, 'Adding key for {0}'
+                  .format(EEVariables.ee_mysql_repo))
+        EERepo.add_key(self, '0xcbcb082a1bb943db',
+                       keyserver="keyserver.ubuntu.com")
+
+        config = configparser.ConfigParser()
+        config.read(os.path.expanduser("~")+'/.my.cnf')
+        try:
+            chars = config['client']['password']
+        except Exception as e:
+            Log.error(self, "Error: process exited with error %s"
+                            % e)
+
+        Log.debug(self, "Pre-seeding MariaDB")
+        Log.debug(self, "echo \"mariadb-server-10.0 "
+                        "mysql-server/root_password "
+                        "password \" | "
+                        "debconf-set-selections")
+        EEShellExec.cmd_exec(self, "echo \"mariadb-server-10.0 "
+                                   "mysql-server/root_password "
+                                   "password {chars}\" | "
+                                   "debconf-set-selections"
+                                   .format(chars=chars),
+                                   log=False)
+        Log.debug(self, "echo \"mariadb-server-10.0 "
+                        "mysql-server/root_password_again "
+                        "password \" | "
+                        "debconf-set-selections")
+        EEShellExec.cmd_exec(self, "echo \"mariadb-server-10.0 "
+                                   "mysql-server/root_password_again "
+                                   "password {chars}\" | "
+                                   "debconf-set-selections"
+                                   .format(chars=chars),
+                                   log=False)
+
+        # Install MariaDB
+        apt_packages = EEVariables.ee_mysql
+        Log.info(self, "Updating apt-cache, please wait ...")
+        EEAptGet.update(self)
+        Log.info(self, "Installing MariaDB, please wait ...")
+        EEAptGet.install(self, apt_packages)
+
+    @expose(hide=True)
+    def default(self):
+        if ((not self.app.pargs.mariadb)):
+            self.app.args.print_help()
+        if self.app.pargs.mariadb:
+            if EEVariables.ee_mysql_host is not "localhost":
+                Log.error(self, "Remote MySQL found, EasyEngine will not "
+                          "install MariaDB")
+
+            if EEShellExec.cmd_exec(self, "mysqladmin ping") and (not
+               EEAptGet.is_installed(self, 'mariadb-server')):
+
+                Log.info(self, "If your database size is big, "
+                         "migration may take some time.")
+                Log.info(self, "During migration non nginx-cached parts of "
+                         "your site may remain down")
+                start_migrate = input("Type \"mariadb\" to continue:")
+                if start_migrate != "mariadb":
+                    Log.error(self, "Not starting migration")
+                self.migrate_mariadb()
+            else:
+                Log.error(self, "Your current MySQL is not alive or "
+                          "you allready installed MariaDB")

ee/core/mysql.py

@@ -3,7 +3,9 @@ import pymysql
 import configparser
 from os.path import expanduser
 import sys
+import os
 from ee.core.logging import Log
+from ee.core.variables import EEVariables
 
 
 class EEMysql():
@@ -60,7 +62,42 @@ class EEMysql():
                 else:
                     Log.error(self, '{0}'.format(errormsg))
 
+    def backupAll(self):
+        import subprocess
+        try:
+            Log.info(self, "Backing up database at location: "
+                     "/var/ee-mysqlbackup")
+            # Setup Nginx common directory
+            if not os.path.exists('/var/ee-mysqlbackup'):
+                Log.debug(self, 'Creating directory'
+                          '/var/ee-mysqlbackup')
+                os.makedirs('/var/ee-mysqlbackup')
 
-#    def __del__(self):
-#        self.cur.close()
-#        self.conn.close()
+            db = subprocess.check_output(["mysql -Bse \'show databases\'"],
+                                         universal_newlines=True,
+                                         shell=True).split('\n')
+            for dbs in db:
+                if dbs == "":
+                    continue
+                Log.info(self, "Backing up {0} database".format(dbs))
+                p1 = subprocess.Popen("mysqldump {0}"
+                                      " --max_allowed_packet=1024M"
+                                      " --single-transaction".format(dbs),
+                                      stdout=subprocess.PIPE,
+                                      stderr=subprocess.PIPE, shell=True)
+                p2 = subprocess.Popen("gzip -c > /var/ee-mysqlbackup/{0}{1}.s"
+                                      "ql.gz".format(dbs, EEVariables.ee_date),
+                                      stdin=p1.stdout,
+                                      shell=True)
+
+                # Allow p1 to receive a SIGPIPE if p2 exits
+                p1.stdout.close()
+                output = p1.stderr.read()
+
+                if output == b'':
+                    Log.debug(self, "done")
+                else:
+                    Log.error(self, output)
+        except Exception as e:
+            Log.error(self, "Error: process exited with status %s"
+                            % e)