I have a MariaDB Columnstore Cluster of one User Module and two Permormance Modules. (UM1, PM1 and PM2)
Now I want to add a second User Module (UM2) which connects to the PM1 and PM2.
Do I have to install all four Modules from ground, or can I just install MariaDB Columnstore on UM2 and refer towards UM1 and PM1 and PM2, without installing software on UM1, PM1 and PM2?
(UM1, PM1 and PM2 are in production, so there for the can not be re-installed)
According to documentation, a User Module can be added to MariaDB ColumnStore. I highly recommend testing the addModule procedure on your test environment first.
Related
I'm attempting to configure failed login attempts with MariaDB 10.3. Using the following query (from mysql docs, hoping mariadb would be very similar):
ALTER USER 'mariadb_user'#'localhost' FAILED_LOGIN_ATTEMPTS 4 PASSWORD_LOCK_TIME UNBOUNDED;
This returns:
You have an error in your SQL syntax; check the manual that
corresponds to your MariaDB server version for the right syntax to use
near 'FAILED_LOGIN_ATTEMPTS 4 PASSWORD_LOCK_TIME UNBOUNDED' at line 2
Does MariaDB actually support FAILED_LOGIN_ATTEMPTS? I didn't find anything useful when searching the documentation for relevant keywords.
This feature isn't supported by MariaDB.
As an alternative, you can use the global system variable max_password_errors which was introduced in MariaDB 10.4.
Note: max_password_errors will be ignored for localhost connections (:1, 127.0.0.1)
Recently I installed Intel OneAPI including c compiler, FORTRAN compiler and mpi library and complied VASP with it.
Before presenting the question, there are some tricks I need to clarify during the installation of VASP:
GLIBC2.14: the cluster is an old machine with a glibc version of 2.12, where OneAPI needs a version of 2.14. So I compile the GLIBC2.14 and export the ld_path: export LD_LIBRARY_PATH="~/mysoft/glibc214/lib:$LD_LIBRARY_PATH"
ld 2.24: The ld version is 2.20 in the cluster, while a higher version is needed. So I installed binutils 2.24.
There is one master computer connected with 30 calculating nodes in the cluster. The calculation is executed with 3 ways:
When I do the calculation in the master, it's totally OK.
When I login the nodes manually with rsh command, the calculation in the logged node is also no problem.
But usually I submit the calculation script from the master (with slurm or pbs), and then do the calculation in the node. In that case, I met following error message:
[mpiexec#node3.alineos.net] poll_for_event (../../../../../src/pm/i_hydra/libhydra/demux/hydra_demux_poll.c:159): check exit codes error
[mpiexec#node3.alineos.net] HYD_dmx_poll_wait_for_proxy_event (../../../../../src/pm/i_hydra/libhydra/demux/hydra_demux_poll.c:212): poll for event error
[mpiexec#node3.alineos.net] HYD_bstrap_setup (../../../../../src/pm/i_hydra/libhydra/bstrap/src/intel/i_hydra_bstrap.c:1062): error waiting for event
[mpiexec#node3.alineos.net] HYD_print_bstrap_setup_error_message (../../../../../src/pm/i_hydra/mpiexec/intel/i_mpiexec.c:1015): error setting up the bootstrap proxies
[mpiexec#node3.alineos.net] Possible reasons:
[mpiexec#node3.alineos.net] 1. Host is unavailable. Please check that all hosts are available.
[mpiexec#node3.alineos.net] 2. Cannot launch hydra_bstrap_proxy or it crashed on one of the hosts. Make sure hydra_bstrap_proxy is available on all hosts and it has right permissions.
[mpiexec#node3.alineos.net] 3. Firewall refused connection. Check that enough ports are allowed in the firewall and specify them with the I_MPI_PORT_RANGE variable.
[mpiexec#node3.alineos.net] 4. pbs bootstrap cannot launch processes on remote host. You may try using -bootstrap option to select alternative launcher.
I only met this error with oneAPI compiled codes but Intel® Parallel Studio XE compiled. Do you have any idea of this error? Your response will be highly appreciated.
Best,
Léon
Could it be a permissions error with the Slurm agent not having the correct permissions or library path?
I had to redo my server (Debian 9) in Proxmox. I updated a package (libc6) and I broke the dependencies (I didn't snapshot it...). One of the affected daemons was MySQL / MariaDB, I could not make a backup from PhpMyAdmin because the daemon does not work and I could not connect to the database.
Now I have installed Debian 10, but I am having problems recovering the database from the other machine.
mysqldump: Couldn't execute 'show create table `xxx.yyy`': Table 'yyy' doesn't exist in engine (1932)
The following errors are prompted when I tried the following solutions:
root#debian:~# mysqldump -u root -p --all-databases > all_databases.sql
Enter password:
mysqldump: Got error: 1932: "Table 'mysql.gtid_slave_pos' doesn't exist in engine" when using LOCK TABLES
root#debian:~# mysqldump --skip-lock-tables -u root -p --all-databases > all_databases.sql
Enter password:
mysqldump: Couldn't execute 'show create table `gtid_slave_pos`': Table 'mysql.gtid_slave_pos' doesn't exist in engine (1932)
Source: https://support.plesk.com/hc/en-us/articles/213931725-Dump-of-the-MySQL-database-hosted-on-the-Plesk-server-fails-mysqldump-table-doesn-t-exist-when-using-LOCK-TABLES
root#debian:~# mysqlfrm --server=xxx:yyy#localhost:3306 test.frm --port=3310
WARNING: Using a password on the command line interface can be insecure.
# Source on localhost: ...
Usage: mysqlfrm --server=[user[:<pass>]#host[:<port>][:<socket>]|<login-path>[:<port>][:<socket>]] [path\tbl1.frm|db:tbl.frm]
mysqlfrm: error: Can't connect to MySQL server on 'localhost:3306' (111 Connection refused)
Source: https://dba.stackexchange.com/a/127813
MariaDB [(none)]> ALTER TABLE mysql.gtid_slave_pos DISCARD TABLESPACE;
ERROR 1932 (42S02): Table 'mysql.gtid_slave_pos' doesn't exist in engine
Source: Restore MySQL database using only .frm and .ibd files
Is there any option left?
EDIT:
I'll answer some questions danblack asked me.
How did I get into this state?
I don't exactly know it but I think that I broke MySQL after I tried to restart several times mysqld/mariadb service while I tried several solutions downgrading libc6 or trying to make mariadb to run again.
What was the MySQL/MariaDB version in Debian 9?
mariadb Ver 15.1 Distrib 10.1.44-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2
What is the version in Debian 10?
mariadb Ver 15.1 Distrib 10.3.22-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2
Did I copy the entire datadir from one to another?
No, I didn't try that... But I didn't find anything useful on stackoverflow sites nor google.
Did I run mysql_upgrade?
No, I didn't try that maybe by updating mariadb in Debian 9 could be a possible solution. But reviewing packages for Debian 9, I didn't found the mariadb 10.3 version for Debian 9 (the one that clib6 2.30-10 requires, I was on 2.14).
Can you take a mysqldump of other databases in the server (ie. not the mysql named one)?
Yes, I did backups for some databases but I couldn't backup all of them (only 3 or 4 from 10).
You have at least 2 options:
Option #1: Fix it in-place.
Create a snapshot and/or backup of the server before trying to fix anything.
Remove mariadb.
Install mariadb...which should fix any software issues preventing it from starting up.
Once it is working, create a backup of your databases using mysqldump.
Option #2: Create a new server.
Spin up another virtual machine just like it (install the same OS and MariaDB version).
Stop the new mariadb service and copy the database files from the old server to the new. The default location on Ubuntu is /var/lib/mysql/
Once you overwrite the files, start the mariadb service and jump into the mysql prompt to verify that the databases show up. (e.g. show databases;)
Once it is working, create a backup of your databases using mysqldump.
This is how I install MariaDB onto a server and setup automated backups: https://hammondslegacy.com/forum/viewtopic.php?f=40&t=266
The syntax is
`dbname`.`tablename`
not
`dbname.tablename`
I'm trying to install Sahara in OpenStack(Pike version).
I adapted the installation from here https://picoledelimao.github.io/blog/2017/01/25/how-to-install-sahara-and-sahara-dashboard-on-openstack-newton/
and I followed the below steps
Create and configure sahara database
Create an openstack sahara user, service and endpoints
Installation of sahara
Configurationf of sahara.conf
Change max connection parameter in mysql/my.cnf from 16M to 256M
Restart mysql service
Restart sahara-api and sahara-engine
Installation of sahara dashboard
Manage the saharadashboard and openstack dashboard files
Restart apache2
Open the dashboard and verify the presence of data processing
In the last step, I see the data-processing but I have a lot of error. For example Error: Unable to fetch node group template list. I think it is due to the absence of plugin and cluster template.
Can someone explain me how to add them to Sahara?
I have a production 64-bit MySQL DB server (version 5.1.69 - Source distribution) with 8 cores and 8 GB RAM, and I want it to fully utilize all cores and all available memory. I use InnoDB and I read that I should set the following in my.cnf configuration file:
innodb_read_io_threads = 64
innodb_write_io_threads = 64
From some reason, both variables don't exist. When I add them to the configuration file, MySQL fails to load. Moreover, the following query returns zero results:
show global variables like '%innodb_read_%';
Any suggestions? Thanks.
The InnoDB Plugin has been included in MySQL since version 5.1.38, but it has to be installed.
MySQL 5.5/5.6 has the new InnoDB Plugin installed by default. You could just upgrade to 5.5/5.6
If you really want to stay with MySQL 5.1.69, you can go to the MySQL Documentation on how to do the install of the InnoDB Plugin : http://dev.mysql.com/doc/innodb-plugin/1.0/en/innodb-plugin-installation-dynamic-posix.html
I wrote about this in the DBA StackExchange back in May 2012 : https://dba.stackexchange.com/questions/18203/mysql-installing-innodb-plugin/18240#18240