Database Installation

This HOWTO describes the installation of the Stroom databases.

Tags:

Following this HOWTO will produce a simple, minimally secured database deployment. In a production environment consideration needs to be made for redundancy, better security, data-store location, increased memory usage, and the like.

Stroom has two databases. The first, stroom, is used for management of Stroom itself and the second, statistics is used for the Stroom Statistics capability. There are many ways to deploy these two databases. One could

have a single database instance and serve both databases from it
have two database instances on the same server and serve one database per instance
have two separate nodes, each with it’s own database instance
the list goes on.

In this HOWTO, we describe the deployment of two database instances on the one node, each serving a single database. We provide example deployments using either the MariaDB or MySQL Community versions of MySQL.

Assumptions

we are installing the MariaDB or MySQL Community RDBMS software.
the primary database node is ‘stroomdb0.strmdev00.org’.
installation is on a fully patched minimal Centos 7.3 instance.
we are installing BOTH databases (stroom and statistics) on the same node - ‘stroomdb0.stromdev00.org’ but with two distinct database engines. The first database will communicate on port 3307 and the second on 3308.
we are deploying with SELinux in enforcing mode.
any scripts or commands that should run are in code blocks and are designed to allow the user to cut then paste the commands onto their systems.
in this document, when a textual screen capture is documented, data entry is identified by the data surrounded by ‘<’ ‘>’ . This excludes enter/return presses.

Installation of Software

MariaDB Server Installation

As MariaDB is directly supported by Centos 7, we simply install the database server software and SELinux policy files, as per

sudo yum -y install policycoreutils-python mariadb-server

MySQL Community Server Installation

As MySQL is not directly supported by Centos 7, we need to install it’s repository files prior to installation. We get the current MySQL Community release repository rpm and validate it’s MD5 checksum against the published value found on the MySQL Yum Repository site.

wget https://repo.mysql.com/mysql57-community-release-el7.rpm
md5sum mysql57-community-release-el7.rpm

On correct validation of the MD5 checksum, we install the repository files via

sudo yum -y localinstall mysql57-community-release-el7.rpm

NOTE: Stroom currently does not support the latest production MySQL version - 5.7. You will need to install MySQL Version 5.6.

Now since we must use MySQL Version 5.6 you will need to edit the MySQL repo file /etc/yum.repos.d/mysql-community.repo to disable the mysql57-community channel and enable the mysql56-community channel. We start by, backing up the repo file with

sudo cp /etc/yum.repos.d/mysql-community.repo /etc/yum.repos.d/mysql-community.repo.ORIG

Then edit the file to change

...
# Enable to use MySQL 5.6
[mysql56-community]
name=MySQL 5.6 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.6-community/el/7/$basearch/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

[mysql57-community]
name=MySQL 5.7 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/7/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
...

to become

...
# Enable to use MySQL 5.6
[mysql56-community]
name=MySQL 5.6 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.6-community/el/7/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

[mysql57-community]
name=MySQL 5.7 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/7/$basearch/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
...

Next we install server software and SELinux policy files, as per

sudo yum -y install policycoreutils-python mysql-community-server

Preparing the Database Deployment

MariaDB Variant

Create and instantiate both database instances

To set up two MariaDB database instances on the one node, we will use mysql_multi and systemd service templates. The mysql_multi utility is a capability that manages multiple MariaDB databases on the same node and systemd service templates manage multiple services from one configuration file. A systemd service template is unique in that it has an @ character before the .service suffix.

To use this multiple-instance capability, we need to create two data directories for each database instance and also replace the main MariaDB configuration file, /etc/my.cnf, with one that includes configuration of key options for each instance. We will name our instances, mysqld0 and mysqld1. We will also create specific log files for each instance.

We will use the directories, /var/lib/mysql-mysqld0 and /var/lib/mysql-mysqld1 for the data directories and /var/log/mariadb/mysql-mysqld0.log and /var/log/mariadb/mysql-mysqld1.log for the log files. Note you should modify /etc/logrotate.d/mariadb to manage these log files. Note also, we need to set the appropriate SELinux file contexts on the created directories and any files.

We create the data directories and log files and set their respective SELinux contexts via

sudo mkdir /var/lib/mysql-mysqld0
sudo chown mysql:mysql /var/lib/mysql-mysqld0
sudo semanage fcontext -a -t mysqld_db_t "/var/lib/mysql-mysqld0(/.*)?"
sudo restorecon -Rv /var/lib/mysql-mysqld0

sudo touch /var/log/mariadb/mysql-mysqld0.log
sudo chown mysql:mysql /var/log/mariadb/mysql-mysqld0.log
sudo chcon --reference=/var/log/mariadb/mariadb.log /var/log/mariadb/mysql-mysqld0.log

sudo mkdir /var/lib/mysql-mysqld1
sudo chown mysql:mysql /var/lib/mysql-mysqld1
sudo semanage fcontext -a -t mysqld_db_t "/var/lib/mysql-mysqld1(/.*)?"
sudo restorecon -Rv /var/lib/mysql-mysqld1

sudo touch /var/log/mariadb/mysql-mysqld1.log
sudo chown mysql:mysql /var/log/mariadb/mysql-mysqld1.log
sudo chcon --reference=/var/log/mariadb/mariadb.log /var/log/mariadb/mysql-mysqld1.log

We now initialise the our two database data directories via

sudo mysql_install_db --user=mysql --datadir=/var/lib/mysql-mysqld0
sudo mysql_install_db --user=mysql --datadir=/var/lib/mysql-mysqld1

We now replace the MySQL configuration file to set the options for each instance. Note that we will serve mysqld0 and mysqld1 via TCP ports 3307 and 3308 respectively. First backup the existing configuration file with

sudo cp /etc/my.cnf /etc/my.cnf.ORIG

then setup /etc/my.cnf as per

sudo bash
F=/etc/my.cnf
printf '[mysqld_multi]\n' > ${F}
printf 'mysqld = /usr/bin/mysqld_safe --basedir=/usr\n' >> ${F}
printf '\n' >> ${F}
printf '[mysqld0]\n' >> ${F}
printf 'port=3307\n' >> ${F}
printf 'mysqld = /usr/bin/mysqld_safe --basedir=/usr\n' >> ${F}
printf 'datadir=/var/lib/mysql-mysqld0/\n' >> ${F}
printf 'socket=/var/lib/mysql-mysqld0/mysql.sock\n' >> ${F}
printf 'pid-file=/var/run/mariadb/mysql-mysqld0.pid\n' >> ${F}
printf '\n' >> ${F}
printf 'log-error=/var/log/mariadb/mysql-mysqld0.log\n' >> ${F}
printf '\n' >> ${F}
printf '# Disabling symbolic-links is recommended to prevent assorted security\n' >> ${F}
printf '# risks\n' >> ${F}
printf 'symbolic-links=0\n' >> ${F}
printf '\n' >> ${F}
printf '[mysqld1]\n' >> ${F}
printf 'mysqld = /usr/bin/mysqld_safe --basedir=/usr\n' >> ${F}
printf 'port=3308\n' >> ${F}
printf 'datadir=/var/lib/mysql-mysqld1/\n' >> ${F}
printf 'socket=/var/lib/mysql-mysqld1/mysql.sock\n' >> ${F}
printf 'pid-file=/var/run/mariadb/mysql-mysqld1.pid\n' >> ${F}
printf '\n' >> ${F}
printf 'log-error=/var/log/mariadb/mysql-mysqld1.log\n' >> ${F}
printf '\n' >> ${F}
printf '# Disabling symbolic-links is recommended to prevent assorted security risks\n' >> ${F}
printf 'symbolic-links=0\n' >> ${F}
exit # To exit the root shell

We also need to associate the ports with the mysqld_port_t SELinux context as per

sudo semanage port -a -t mysqld_port_t -p tcp 3307
sudo semanage port -a -t mysqld_port_t -p tcp 3308

We next create the systemd service template as per

sudo bash
F=/etc/systemd/system/mysqld@.service

printf '# Install in /etc/systemd/system\n' > ${F}
printf '# Enable via systemctl enable mysqld@0 or systemctl enable mysqld@1\n' >> ${F}
printf '[Unit]\n' >> ${F}
printf 'Description=MySQL Multi Server for instance %%i\n' >> ${F}
printf 'After=syslog.target\n' >> ${F}
printf 'After=network.target\n' >> ${F}
printf '\n' >> ${F}
printf '[Service]\n' >> ${F}
printf 'User=mysql\n' >> ${F}
printf 'Group=mysql\n' >> ${F}
printf 'Type=forking\n' >> ${F}
printf 'ExecStart=/usr/bin/mysqld_multi start %%i\n' >> ${F}
printf 'ExecStop=/usr/bin/mysqld_multi stop %%i\n' >> ${F}
printf 'Restart=always\n' >> ${F}
printf 'PrivateTmp=true\n' >> ${F}
printf '\n' >> ${F}
printf '[Install]\n' >> ${F}
printf 'WantedBy=multi-user.target\n' >> ${F}
chmod 644 ${F}
exit; # to exit the root shell

We next enable and start both instances via

sudo systemctl enable mysqld@0
sudo systemctl enable mysqld@1
sudo systemctl start mysqld@0
sudo systemctl start mysqld@1

At this we should have both instances running. One should check each instance’s log file for any errors.

Secure each database instance

We secure each database engine by running the mysql_secure_installation script. One should accept all defaults, which means the only entry (aside from pressing returns) is the administrator (root) database password. Make a note of the password you use. In this case we will use Stroom5User@. The utility mysql_secure_installation expects to find the Linux socket file to access the database it’s securing at /var/lib/mysql/mysql.sock. Since we have used other locations, we temporarily link the real socket file to /var/lib/mysql/mysql.sock for each invocation of the utility. Thus we execute

sudo ln /var/lib/mysql-mysqld0/mysql.sock /var/lib/mysql/mysql.sock
sudo mysql_secure_installation

to see

NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MariaDB
      SERVERS IN PRODUCTION USE!  PLEASE READ EACH STEP CAREFULLY!

In order to log into MariaDB to secure it, we'll need the current
password for the root user.  If you've just installed MariaDB, and
you haven't set the root password yet, the password will be blank,
so you should just press enter here.

Enter current password for root (enter for none): 
OK, successfully used password, moving on...

Setting the root password ensures that nobody can log into the MariaDB
root user without the proper authorisation.

Set root password? [Y/n] 
New password: <__ Stroom5User@ __>
Re-enter new password: <__ Stroom5User@ __>
Password updated successfully!
Reloading privilege tables..
 ... Success!


By default, a MariaDB installation has an anonymous user, allowing anyone
to log into MariaDB without having to have a user account created for
them.  This is intended only for testing, and to make the installation
go a bit smoother.  You should remove them before moving into a
production environment.

Remove anonymous users? [Y/n] 
 ... Success!

Normally, root should only be allowed to connect from 'localhost'.  This
ensures that someone cannot guess at the root password from the network.

Disallow root login remotely? [Y/n] 
 ... Success!

By default, MariaDB comes with a database named 'test' that anyone can
access.  This is also intended only for testing, and should be removed
before moving into a production environment.

Remove test database and access to it? [Y/n]
 - Dropping test database...
 ... Success!
 - Removing privileges on test database...
 ... Success!

Reloading the privilege tables will ensure that all changes made so far
will take effect immediately.

Reload privilege tables now? [Y/n]
... Success!

Cleaning up...

All done!  If you've completed all of the above steps, your MariaDB
installation should now be secure.

Thanks for using MariaDB!

then we execute

sudo rm /var/lib/mysql/mysql.sock
sudo ln /var/lib/mysql-mysqld1/mysql.sock /var/lib/mysql/mysql.sock
sudo mysql_secure_installation
sudo rm /var/lib/mysql/mysql.sock

and process as before (for when running mysql_secure_installation). At this both database instances should be secure.

MySQL Community Variant

Create and instantiate both database instances

To set up two MySQL database instances on the one node, we will use mysql_multi and systemd service templates. The mysql_multi utility is a capability that manages multiple MySQL databases on the same node and systemd service templates manage multiple services from one configuration file. A systemd service template is unique in that it has an @ character before the .service suffix.

To use this multiple-instance capability, we need to create two data directories for each database instance and also replace the main MySQL configuration file, /etc/my.cnf, with one that includes configuration of key options for each instance. We will name our instances, mysqld0 and mysqld1. We will also create specific log files for each instance.

We will use the directories, /var/lib/mysql-mysqld0 and /var/lib/mysql-mysqld1 for the data directories and /var/log/mysql-mysqld0.log and /var/log/mysql-mysqld1.log for the log directories. Note you should modify /etc/logrotate.d/mysql to manage these log files. Note also, we need to set the appropriate SELinux file context on the created directories and files.

sudo mkdir /var/lib/mysql-mysqld0
sudo chown mysql:mysql /var/lib/mysql-mysqld0
sudo semanage fcontext -a -t mysqld_db_t "/var/lib/mysql-mysqld0(/.*)?"
sudo restorecon -Rv /var/lib/mysql-mysqld0

sudo touch /var/log/mysql-mysqld0.log
sudo chown mysql:mysql /var/log/mysql-mysqld0.log
sudo chcon --reference=/var/log/mysqld.log /var/log/mysql-mysqld0.log

sudo mkdir /var/lib/mysql-mysqld1
sudo chown mysql:mysql /var/lib/mysql-mysqld1 
sudo semanage fcontext -a -t mysqld_db_t "/var/lib/mysql-mysqld1(/.*)?"
sudo restorecon -Rv /var/lib/mysql-mysqld1

sudo touch /var/log/mysql-mysqld1.log
sudo chown mysql:mysql /var/log/mysql-mysqld1.log
sudo chcon --reference=/var/log/mysqld.log /var/log/mysql-mysqld1.log

We now initialise the our two database data directories via

sudo mysql_install_db --user=mysql --datadir=/var/lib/mysql-mysqld0
sudo mysql_install_db --user=mysql --datadir=/var/lib/mysql-mysqld1

Disable the default database via

sudo systemctl disable mysqld

We now modify the MySQL configuration file to set the options for each instance. Note that we will serve mysqld0 and mysqld1 via TCP ports 3307 and 3308 respectively. First backup the existing configuration file with

sudo cp /etc/my.cnf /etc/my.cnf.ORIG

then setup /etc/my.cnf as per

sudo bash
F=/etc/my.cnf
printf '[mysqld_multi]\n' > ${F}
printf 'mysqld = /usr/bin/mysqld_safe --basedir=/usr\n' >> ${F}
printf '\n' >> ${F}
printf '[mysqld0]\n' >> ${F}
printf 'port=3307\n' >> ${F}
printf 'mysqld = /usr/bin/mysqld_safe --basedir=/usr\n' >> ${F}
printf 'datadir=/var/lib/mysql-mysqld0/\n' >> ${F}
printf 'socket=/var/lib/mysql-mysqld0/mysql.sock\n' >> ${F}
printf 'pid-file=/var/run/mysqld/mysql-mysqld0.pid\n' >> ${F}
printf '\n' >> ${F}
printf 'log-error=/var/log/mysql-mysqld0.log\n' >> ${F}
printf '\n' >> ${F}
printf '# Disabling symbolic-links is recommended to prevent assorted security\n' >> ${F}
printf '# risks\n' >> ${F}
printf 'symbolic-links=0\n' >> ${F}
printf '\n' >> ${F}
printf '[mysqld1]\n' >> ${F}
printf 'mysqld = /usr/bin/mysqld_safe --basedir=/usr\n' >> ${F}
printf 'port=3308\n' >> ${F}
printf 'datadir=/var/lib/mysql-mysqld1/\n' >> ${F}
printf 'socket=/var/lib/mysql-mysqld1/mysql.sock\n' >> ${F}
printf 'pid-file=/var/run/mysqld/mysql-mysqld1.pid\n' >> ${F}
printf '\n' >> ${F}
printf 'log-error=/var/log/mysql-mysqld1.log\n' >> ${F}
printf '\n' >> ${F}
printf '# Disabling symbolic-links is recommended to prevent assorted security risks\n' >> ${F}
printf 'symbolic-links=0\n' >> ${F}
exit # To exit the root shell

We also need to associate the ports with the mysqld_port_t SELinux context as per

sudo semanage port -a -t mysqld_port_t -p tcp 3307
sudo semanage port -a -t mysqld_port_t -p tcp 3308

We next create the systemd service template as per

sudo bash
F=/etc/systemd/system/mysqld@.service

printf '# Install in /etc/systemd/system\n' > ${F}
printf '# Enable via systemctl enable mysqld@0 or systemctl enable mysqld@1\n' >> ${F}
printf '[Unit]\n' >> ${F}
printf 'Description=MySQL Multi Server for instance %%i\n' >> ${F}
printf 'After=syslog.target\n' >> ${F}
printf 'After=network.target\n' >> ${F}
printf '\n' >> ${F}
printf '[Service]\n' >> ${F}
printf 'User=mysql\n' >> ${F}
printf 'Group=mysql\n' >> ${F}
printf 'Type=forking\n' >> ${F}
printf 'ExecStart=/usr/bin/mysqld_multi start %%i\n' >> ${F}
printf 'ExecStop=/usr/bin/mysqld_multi stop %%i\n' >> ${F}
printf 'Restart=always\n' >> ${F}
printf 'PrivateTmp=true\n' >> ${F}
printf '\n' >> ${F}
printf '[Install]\n' >> ${F}
printf 'WantedBy=multi-user.target\n' >> ${F}
chmod 644 ${F}
exit; # to exit the root shell

We next enable and start both instances via

sudo systemctl enable mysqld@0
sudo systemctl enable mysqld@1
sudo systemctl start mysqld@0
sudo systemctl start mysqld@1

At this we should have both instances running. One should check each instance’s log file for any errors.

Secure each database instance

sudo ln /var/lib/mysql-mysqld0/mysql.sock /var/lib/mysql/mysql.sock
sudo mysql_secure_installation

to see

NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MySQL
      SERVERS IN PRODUCTION USE!  PLEASE READ EACH STEP CAREFULLY!

In order to log into MySQL to secure it, we'll need the current
password for the root user.  If you've just installed MySQL, and
you haven't set the root password yet, the password will be blank,
so you should just press enter here.

Enter current password for root (enter for none): 
OK, successfully used password, moving on...

Setting the root password ensures that nobody can log into the MySQL
root user without the proper authorisation.

Set root password? [Y/n] y
New password: <__ Stroom5User@ __>
Re-enter new password: <__ Stroom5User@ __>
Password updated successfully!
Reloading privilege tables..
 ... Success!


By default, a MySQL installation has an anonymous user, allowing anyone
to log into MySQL without having to have a user account created for
them.  This is intended only for testing, and to make the installation
go a bit smoother.  You should remove them before moving into a
production environment.

Remove anonymous users? [Y/n] 
 ... Success!

Normally, root should only be allowed to connect from 'localhost'.  This
ensures that someone cannot guess at the root password from the network.

Disallow root login remotely? [Y/n] 
 ... Success!

By default, MySQL comes with a database named 'test' that anyone can
access.  This is also intended only for testing, and should be removed
before moving into a production environment.

Remove test database and access to it? [Y/n] 
 - Dropping test database...
ERROR 1008 (HY000) at line 1: Can't drop database 'test'; database doesn't exist
 ... Failed!  Not critical, keep moving...
 - Removing privileges on test database...
 ... Success!

Reloading the privilege tables will ensure that all changes made so far
will take effect immediately.

Reload privilege tables now? [Y/n] 
 ... Success!




All done!  If you've completed all of the above steps, your MySQL
installation should now be secure.

Thanks for using MySQL!


Cleaning up...

then we execute

sudo rm /var/lib/mysql/mysql.sock
sudo ln /var/lib/mysql-mysqld1/mysql.sock /var/lib/mysql/mysql.sock
sudo mysql_secure_installation
sudo rm /var/lib/mysql/mysql.sock

and process as before (for when running mysql_secure_installation). At this both database instances should be secure.

Create the Databases and Enable access by the Stroom processing users

We now create the stroom database within the first instance, mysqld0 and the statistics database within the second instance mysqld1. It does not matter which database variant used as all commands are the same for both.

As well as creating the databases, we also need to establish the Stroom processing users that the Stroom processing nodes will use to access each database. For the stroom database, we will use the database user stroomuser with a password of Stroompassword1@ and for the statistics database, we will use the database user stroomstats with a password of Stroompassword2@. One identifies a processing user as <user>@<host> on a grant SQL command.

In the stroom database instance, we will grant access for

stroomuser@localhost for local access for maintenance etc.
stroomuser@stroomp00.strmdev00.org for access by processing node stroomp00.strmdev00.org
stroomuser@stroomp01.strmdev00.org for access by processing node stroomp01.strmdev00.org

and in the statistics database instance, we will grant access for

stroomstats@localhost for local access for maintenance etc.
stroomstats@stroomp00.strmdev00.org for access by processing node stroomp00.strmdev00.org
stroomstats@stroomp01.strmdev00.org for access by processing node stroomp01.strmdev00.org

Thus for the stroom database we execute

mysql --user=root --port=3307 --socket=/var/lib/mysql-mysqld0/mysql.sock --password

and on entering the administrator’s password, we arrive at the MariaDB [(none)]> or mysql> prompt. At this we create the database with

create database stroom;

and then to establish the users, we execute

grant all privileges on stroom.* to stroomuser@localhost identified by 'Stroompassword1@';
grant all privileges on stroom.* to stroomuser@stroomp00.strmdev00.org identified by 'Stroompassword1@';
grant all privileges on stroom.* to stroomuser@stroomp01.strmdev00.org identified by 'Stroompassword1@';

then

quit;

to exit.

And for the statistics database

mysql --user=root --port=3308 --socket=/var/lib/mysql-mysqld1/mysql.sock --password

with

create database statistics;

and then to establish the users, we execute

grant all privileges on statistics.* to stroomstats@localhost identified by 'Stroompassword2@';
grant all privileges on statistics.* to stroomstats@stroomp00.strmdev00.org identified by 'Stroompassword2@';
grant all privileges on statistics.* to stroomstats@stroomp01.strmdev00.org identified by 'Stroompassword2@';

then

quit;

to exit.

Clearly if we need to add more processing nodes, additional grant commands would be used. Further, if we were installing the databases in a single node Stroom environment, we would just have the first two pairs of grants.

Configure Firewall

Next we need to modify our firewall to allow remote access to our databases which listens on ports 3307 and 3308. The simplest way to achieve this is with the commands

sudo firewall-cmd --zone=public --add-port=3307/tcp --permanent
sudo firewall-cmd --zone=public --add-port=3308/tcp --permanent
sudo firewall-cmd --reload
sudo firewall-cmd --zone=public --list-all

Note

That this allows ANY node to connect to your databases. You should give consideration to restricting this to only allowing processing node access.

Debugging of Mariadb for Stroom

If there is a need to debug the Mariadb database and Stroom interaction, one can turn on auditing for the Mariadb service. To do so, log onto the relevant database as the administrative user as per

mysql --user=root --port=3307 --socket=/var/lib/mysql-mysqld0/mysql.sock --password
or
mysql --user=root --port=3308 --socket=/var/lib/mysql-mysqld1/mysql.sock --password

and at the MariaDB [(none)]> prompt enter

install plugin server_audit SONAME 'server_audit';
set global server_audit_file_path='/var/log/mariadb/mysqld-mysqld0_server_audit.log';
or
set global server_audit_file_path='/var/log/mariadb/mysqld-mysqld1_server_audit.log';
set global server_audit_logging=ON;
set global server_audit_file_rotate_size=10485760;
install plugin SQL_ERROR_LOG soname 'sql_errlog';
quit;

The above will generate two log files,

/var/log/mariadb/mysqld-mysqld0_server_audit.log or /var/log/mariadb/mysqld-mysqld1_server_audit.log which records all commands the respective databases run. We have configured the log file will rotate at 10MB in size.
/var/lib/mysql-mysqld0/sql_errors.log or /var/lib/mysql-mysqld1/sql_errors.log which records all erroneous SQL commands. This log file will rotate at 10MB in size. Note we cannot set this filename via the UI, but it will be appear in the data directory.

All files will, by default, generate up to 9 rotated files.

If you wish to rotate a log file manually, log into the database as the administrative user and execute either

set global server_audit_file_rotate_now=1; to rotate the audit log file
set global sql_error_log_rotate=1; to rotate the sql_errlog log file

Initial Database Access

It should be noted that if you monitor the sql_errors.log log file on a new Stooom deployment, when the Stoom Application first starts, it’s initial access to the stroom database will result in the following attempted sql statements.

2017-04-16 16:24:50 stroomuser[stroomuser] @ stroomp00.strmdev00.org [192.168.2.126] ERROR 1146: Table 'stroom.schema_version' doesn't exist : SELECT version FROM schema_version ORDER BY installed_rank DESC
2017-04-16 16:24:50 stroomuser[stroomuser] @ stroomp00.strmdev00.org [192.168.2.126] ERROR 1146: Table 'stroom.STROOM_VER' doesn't exist : SELECT VER_MAJ, VER_MIN, VER_PAT FROM STROOM_VER ORDER BY VER_MAJ DESC, VER_MIN DESC, VER_PAT DESC LIMIT 1
2017-04-16 16:24:50 stroomuser[stroomuser] @ stroomp00.strmdev00.org [192.168.2.126] ERROR 1146: Table 'stroom.FD' doesn't exist : SELECT ID FROM FD LIMIT 1
2017-04-16 16:24:50 stroomuser[stroomuser] @ stroomp00.strmdev00.org [192.168.2.126] ERROR 1146: Table 'stroom.FEED' doesn't exist : SELECT ID FROM FEED LIMIT 1

After this access the application will realise the database does not exist and it will initialise the database.

In the case of the statistics database you may note the following attempted access

2017-04-16 16:25:09 stroomstats[stroomstats] @ stroomp00.strmdev00.org [192.168.2.126] ERROR 1146: Table 'statistics.schema_version' doesn't exist : SELECT version FROM schema_version ORDER BY installed_rank DESC

Again, at this point the application will initialise this database.

Last modified April 25, 2024: Update 7.3 DB migs (f38e2e3)