Bitnami MySQL for Huawei Enterprise Cloud

Transcription

1 Bitnami MySQL for Huawei Enterprise Cloud Description MySQL is a fast, reliable, scalable, and easy to use open-source relational database system. MySQL Server is intended for mission-critical, heavy-load production systems as well as for embedding into mass-deployed software. How to start or stop the services? Each Bitnami stack includes a control script that lets you easily stop, start and restart services. The script is located at /opt/bitnami/ctlscript.sh. Call it without any service name arguments to start all services: sudo /opt/bitnami/ctlscript.sh start Or use it to restart a single service, such as Apache only, by passing the service name as argument: sudo /opt/bitnami/ctlscript.sh restart apache Use this script to stop all services: sudo /opt/bitnami/ctlscript.sh stop Restart the services by running the script without any arguments: sudo /opt/bitnami/ctlscript.sh restart Obtain a list of available services and operations by running the script without any arguments: sudo /opt/bitnami/ctlscript.sh How to upload files to the server with SFTP? NOTE: Bitnami applications can be found in /opt/bitnami/apps.

2 When uploading files via SFTP, you must have the server's IP address, username and password or, if you chose to deploy the server with an SSH key instead of a password, you must have the server username and corresponding SSH private key in.ppk format (for Windows) or in.pem format (for Linux and Mac OS X). To obtain the IP address for your server, follow these steps: Log in to the Huawei Cloud Server Console. Navigate to the "Computing -> Elastic Cloud Server" section. Note the public IP address for the server you wish to connect to. Once you have confirmed that you have the IP address and correct SSH credentials for your server, follow the instructions below depending on the platform you wish to use. Although you can use any SFTP/SCP client to transfer files to your server, this guide documents FileZilla (Windows, Linux and Mac OS X), WinSCP (Windows) and Cyberduck (Mac OS X). Using an SSH Key Once you have your server's SSH key, choose your preferred application and follow the steps below to connect to the server using SFTP. FileZilla IMPORTANT: To use FileZilla, your server private key should be in PPK format. Follow these steps: Download and install FileZilla. Launch FileZilla and use the "Edit -> Settings" command to bring up FileZilla's configuration settings. Within the "Connection -> SFTP" section, use the "Add keyfile" command to select the private key file for the server. FileZilla will use

3 this private key to log in to the server. Use the "File -> Site Manager -> New Site" command to bring up the FileZilla Site Manager, where you can set up a connection to your server. Enter your server host name and specify bitnami as the user name. Select "SFTP" as the protocol and "Ask for password" as the logon type.

4 Use the "Connect" button to connect to the server and begin an SFTP session. You might need to accept the server key, by clicking "Yes" or "OK" to proceed. You should now be logged into the /home/bitnami directory on the server. You can now transfer files by dragging and dropping them from the local server window to the remote server window. If you have problems accessing your server, get extra information by use the "Edit -> Settings -> Debug" menu to activate FileZilla's debug log. WinSCP IMPORTANT: To use WinSCP, your server private key should be in PPK format. Follow these steps: Download and install WinSCP. Launch WinSCP and in the "Session" panel, select "SFTP" as the file protocol.

5 Enter your server host name and specify bitnami as the user name. Click the "Advanced " button and within the "SSH -> Authentication -> Authentication parameters" section, select the private key file for the server. WinSCP will use this private key to log in to the server. From the "Session" panel, use the "Login" button to connect to the server and begin an SCP session.

6 You should now be logged into the /home/bitnami directory on the server. You can now transfer files by dragging and dropping them from the local server window to the remote server window. If you need to upload files to a location where the bitnami user doesn't have write permissions, you have two options: Once you have configured WinSCP as described above, click the "Advanced " button and within the "Environment -> Shell" panel, select sudo su - as your shell. This will allow you to upload files using the administrator account. Upload the files to the /home/bitnami directory as usual. Then, connect via SSH and move the files to the desired location with the sudo command, as shown below: sudo mv /home/bitnami/uploaded-file /path/to/desired/location/ Cyberduck IMPORTANT: To use Cyberduck, your server private key should be in PEM format. Follow these steps:

7 Select the "Open Connection" command and specify "SFTP" as the connection protocol. In the connection details panel, under the "More Options" section, enable the "Use Public Key Authentication" option and specify the path to the private key file for the server. Use the "Connect" button to connect to the server and begin an SFTP session. You should now be logged into the /home/bitnami directory on the server. You can now transfer files by dragging and dropping them from the local server window to the remote server window.

8 Using a Password Once you have your server's SSH credentials, choose your preferred application and follow the steps below to connect to the server using SFTP. FileZilla Follow these steps: Download and install FileZilla. Launch FileZilla and use the "File -> Site Manager -> New Site" command to bring up the FileZilla Site Manager, where you can set up a connection to your server. Enter your server host name. Select "SFTP" as the protocol and "Ask for password" as the logon type. Use bitnami as the server username and the password generated during the server deployment process. Use the "Connect" button to connect to the server and begin an SFTP session. You might need to accept the server key, by clicking "Yes" or "OK" to proceed. You should now be logged into the /home/bitnami directory on the server. You can now transfer files by dragging and dropping them from the local server window to the remote server window.

9 If you have problems accessing your server, get extra information by use the "Edit -> Settings -> Debug" menu to activate FileZilla's debug log. WinSCP Follow these steps: Download and install WinSCP. Launch WinSCP and in the "Session" panel, select "SFTP" as the file protocol. Enter your server host name and set bitnami as the server username.

10 From the "Session" panel, use the "Login" button to connect to the server and begin an SCP session. Enter the password when prompted. You should now be logged into the /home/bitnami directory on the server. You can now transfer files by dragging and dropping them from the local server window to the remote server window. Cyberduck Follow these steps: Select the "Open Connection" command and specify "SFTP" as the connection protocol.

11 In the connection details panel, enter the server IP address, bitnami as the username, and the password generated during the deployment process. Use the "Connect" button to connect to the server and begin an SFTP session. You should now be logged into the /home/bitnami directory on the server. You can now transfer files by dragging and dropping them from the local server window to the remote server window. What is the default configuration? The grant tables define the initial MySQL user accounts and their access privileges. The default configuration consists of: A privileged account with a username of root. The root user has remote access to the database. An anonymous user without remote access to the database server. This user can only connect from the local machine and it is only intended for testing. A test database only intended for testing.

12 Check our recommendations for a production server. MySQL version In order to see which MySQL version your system is running, execute the following command: mysqld --version MySQL configuration file The MySQL configuration file is located at /opt/bitnami/mysql/my.cnf. The MySQL official documentation has more details about how to configure the MySQL database. MySQL socket On Unix, MySQL clients can connect to the server in the local machine using an Unix socket file at /opt/bitnami/mysql/tmp/mysql.sock. MySQL port The default port for MySQL is MySQL Process Identification Number The MySQL.pid file allows other programs to find out the PID (Process Identification Number) of a running script. Find it at /opt/bitnami/mysql/data/mysqld.pid. MySQL error log The log-error file contains information indicating when mysqld was started and stopped and also any critical errors that occur while the server is running. If mysqld notices a table that needs to be automatically checked or repaired, it writes a message to the error log. Find it at /opt/bitnami/mysql/data/mysqld.log. How to connect to the MySQL database? You can connect to the MySQL database from the same computer where it is installed with the mysql client tool.

13 mysql -u root -p You will be prompted to enter the root user password. This is the same as the application password. Find out how to obtain application credentials. How to connect to MySQL from a different machine? To connect to MySQL from a different machine, you must open port 3306 for remote access. Refer to the FAQ for more information on this. Then, use the command below and replace SERVER-IP with the IP address of the server hosting the database. mysql -h SERVER-IP -u root -p You will be prompted to enter the root user password. This is the same as the application password. How to create a database for a custom application? These are the basic steps to create a new database and user for your applications: Create a new database: mysql> create database DATABASE_NAME; Query OK, 1 row affected (0.00 sec) Create a new user (only with local access) and grant privileges to this user on the new database: mysql> grant all privileges on DATABASE_NAME.* TO 'USER_NAME'@'lo calhost' identified by 'PASSWORD' Query OK, 1 row affected (0.00 sec) Create a new user (with remote access) and grant privileges to this user on the new database:

14 mysql> grant all privileges on DATABASE_NAME.* TO identified by 'PASSWORD' Query OK, 1 row affected (0.00 sec) After modifying the MySQL grant tables, execute the following command in order to apply the changes: mysql> flush privileges; Query OK, 1 row affected (0.00 sec) Some applications require specific privileges in the database. Consult the official installation steps in the application's documentation. How to change the MySQL root password? You can modify the MySQL password using the following command at the shell prompt. Replace the NEW_PASSWORD placeholder with the actual password you wish to set. /opt/bitnami/mysql/bin/mysqladmin -p -u root password NEW_PASSWORD How to reset the MySQL root password? If you don't remember your MySQL root password, you can follow the steps below to reset it to a new value: Create a file in /home/bitnami/mysql-init with the content shown below (replace NEW_PASSWORD with the password you wish to use): UPDATE mysql.user SET Password=PASSWORD('NEW_PASSWORD') WHERE Use r='root'; FLUSH PRIVILEGES; If you are using MySQL 5.7 only, use the following content instead of that shown above: UPDATE mysql.user SET authentication_string=password('new_passwor D') WHERE User='root'; FLUSH PRIVILEGES;

15 Stop the MySQL server: sudo /opt/bitnami/ctlscript.sh stop mysql Start MySQL with the following command: sudo /opt/bitnami/mysql/bin/mysqld_safe --pid-file=/opt/bitnami/m ysql/data/mysqld.pid --datadir=/opt/bitnami/mysql/data --init-fil e=/home/bitnami/mysql-init 2> /dev/null & Restart the MySQL server: sudo /opt/bitnami/ctlscript.sh restart mysql Remove the script: rm /home/bitnami/mysql-init How to create a database backup? To back up only the database, create a dump file using the mysqldump tool. mysqldump -u root -p DATABASE_NAME > backup.sql This operation could take some time depending on the database size. How to restore a database backup? Once you have the backup file, you can restore it with a command like the one below: mysql -u root -p DATABASE_NAME < backup.sql If you want to restore the database and the database schema does not exist, it is necessary to first follow the steps described below. As a side note, the value for the BITNAMI_USER_PASSWORD placeholder is included in the application credentials or, if the credentials were defined by the user, it is the same as the application password. mysql -u root -p mysql> create database DATABASE_NAME;

16 mysql> grant all privileges on DATABASE_NAME.* to identified by 'BITNAMI_USER_PASSWORD'; mysql> flush privileges; mysql> exit; mysql -u root -p DATABASE_NAME < backup.sql Note that the steps previously described will only back up the data contained inside your database. There may be other files that you should take into account when performing a full backup, such as files that may have been uploaded to the application. These files are stored in the application folder itself, so copy this folder to have a backup of your uploaded files. How to secure your server from remote connections? Once you have created a new database and user for your application, connect to your MySQL server and follow these recommendations: Remove anonymous users: mysql> DELETE FROM mysql.user WHERE User=''; Remove the test database and access to it: mysql> DROP DATABASE test; mysql> DELETE FROM mysql.db WHERE Db='test' OR Db='test\\_%'; Disallow root login remotely: mysql> DELETE FROM mysql.user WHERE User='root' AND Host NOT IN ('localhost', ' ', '::1'); Don't forget to reload the privileges tables to apply the changes: mysql> FLUSH PRIVILEGES; Change your root user password as explained here. It is strongly recommended that you do not have empty passwords for any user accounts when using the server for any production work.

17 If you don't need remote access, uncomment the line #bind-address= in the MySQL configuration file to only listen for connections on the local machine. Restart the server once done. How to recover a MySQL database with errors? Before trying to recover a MySQL database, you should check the exact error in the MySQL log file at /opt/bitnami/mysql/data/mysqld.log. Check the latest entries in the MySQL log file with the following command: sudo tail -n 100 /opt/bitnami/mysql/data/mysqld.log In this case, assume the following error in the log file: :37:45 [ERROR] Fatal error: Can't open and lock privilege table s: Table 'user' is marked as crashed Here are some steps to resolve this error: The MySQL database is configured to use InnoDB engine by default. You can add the innodb_force_recovery=1 option in the main MySQL configuration file at /opt/bitnami/mysql/etc/my.cnf to try and fix the database: [mysqld] innodb_force_recovery = 1 Start the MySQL database with the following command: mysqld --skip-grant-tables --user=mysql --pid-file=/opt/bitnami/m ysql/data/mysqld.pid --skip-external-locking --port= sock=/opt/bitnami/mysql/tm p/mysql.sock Open a new console and try to log in the database: mysql -u root -p

18 In this case, the error was related to the mysql.user table. Run these commands: mysql> use mysql; mysql> repair table user; mysql> check table user; mysql> exit; If the table is recovered, you should see "OK" in the mysql.user status table. Do not forget to remove the innodb_force_recovery option from the my.cnf file and restart the MySQL server again. sudo /opt/bitnami/ctlscript.sh restart mysql If you find a different error or cannot fix an issue, we can try to help at How to change the data directory? The data directory for MySQL is set to /opt/bitnami/mysql/data by default. You can modify the location of this folder modifying the /opt/bitnami/mysql/my.cnf file, as shown below:... datadir=/opt/bitnami/mysql/data... Also modify the /opt/bitnami/mysql/scripts/ctl.sh file to reflect the new directory location: --datadir=/opt/bitnami/mysql/data Finally, move the data/ directory to the new location and restart the database.