Bulding a mysql based image as follows (Dockerfile):
FROM mysql:5.7
COPY somescripts* /docker-entrypoint-initdb.d/
and then exec-ing into it:
docker run --env="MYSQL_ROOT_PASSWORD=mypassword" -it theimagejustbuilt bash
but ...
root#73857bf5744e:/# mysql
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
Solution 1. Specify "127.0.0.1" as the host instead of localhost, i.e. mysql -h 127.0.0.1 -u root instead of mysql. Note that if you omit the host (mysql -u root) the MySQL client will implicitly use localhost.
Solution 2. In /etc/mysql/my.cnf you should see this near the top of the file:
[client]
port = 3306
socket = /var/run/mysqld/mysqld.sock
Change socket to the location of your MemSQL socket file. By default, this is /var/lib/memsql/data/memsql.sock.
Turns out I was accidentaly overriding the entrypoint via the following command:
docker run --env="MYSQL_ROOT_PASSWORD=mypassword" -it theimagejustbuilt bash
the bash keyword at the end is not needed since it overrides the default entrypoint and connection to mysql service is therefore not possible.
Related
I have 2 mysqld.exe, one from phpMyAdmin and one from MySQL server. I use the command line command "mysql -u root -p" to connect, how do i get this command to connect to MySQL server (port 3307) by default, instead of phpMyAdmin (port 3306). It is fine to add "-P 3307", but I only want to use the command "mysql -u root -p". This command("mysql -u root -p") used to connect to port 3307, i don't know what made it change.
How can i connect to port 3307 by default.
Edit my.cnf and add port 3307 (or the one you want to be defaulted), then restart the service and you should be good.
on my.cnf be sure to have this:
port=3307
to find my.cnf file in linux or windows bash use:
sudo find / -name "my.cnf"
Configuring Multiple MySQL Instances Using systemd, mysql-documents,But how to use mysql client connect?
vim /etc/my.cnf
[mysqld#replica01]
datadir=/var/lib/mysql-replica01
socket=/var/lib/mysql-replica01/mysql.sock
port=3307
log-error=/var/log/mysqld-replica01.log
[mysqld#replica02]
datadir=/var/lib/mysql-replica02
socket=/var/lib/mysql-replica02/mysql.sock
port=3308
log-error=/var/log/mysqld-replica02.log
systemctl start mysqld#replica01
if I do this
shell> mysql -uroot -P3307
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
The mysql client will try to use socket connect by default, despite having received the port parameter in command line. You will need to instruct it to use tcp connection.
Either
mysql -h 127.0.0.1 -P 3307
or
mysql --protocol tcp -P 3307
will do it.
Another way to do it is to avoid tcp configuration parameters, and pass -S (--socket) pointing to socket for your desired instance. In this specific case:
mysql -S /var/lib/mysql-replica01/mysql.sock
I'm writing setup instructions for an application needing a MySQL database, and I'd like it to be easy even for people that don't have a MySQL installation.
Therefore, I'd like to run the MySQL server in a container:
docker run -p 3306:3306 \
--name mysql \
-e MYSQL_ROOT_PASSWORD=test \
-e MYSQL_DATABASE=my_db \
-d mysql
And to be able to connect to it this way:
mysql -u root -ptest -D my_db
Which doesn't work because the MySQL server only listens locally on the container.
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
So I see three options, none of which fitting my needs:
1) Using the container IP everytime
mysql -u root -ptest -D my_db -h 172.17.0.4
Annoying, the IP will often change and I don't want people to have to update their configuration this much.
2) Changing the configuration of MySQL inside the container
Requires to run a docker exec ... each time the container is run, so it's annoying as well.
3) Making a custom image where the configuration suits my needs
Seems a bit overkill, I'm pretty sure there is a better solution.
Thoughts?
When the mysql client is invoked as you did:
mysql -u root -ptest -D my_db
(i.e. without the hostname) or with localhost as hostname it tries to connect to the local server using Unix pipes. A pipe is a special file type and the client communicate with the server through it.
Your MySQL server is not local, it runs on a separate machine. You cannot connect to it using pipes.
As you already noticed, it works if you use the IP address of the container as argument for the -h command line option of mysql.
You also map the port 3306 of the container to port 3306 of the host machine. This means any TCP connection to port 3306 of the local machine goes through this mapping to the port 3306 of the container, where the MySQL server is listening.
Combining the two above, all you have to do is to put 127.0.0.1 as host name in the mysql command line:
mysql -u root -ptest -D my_db -h 127.0.0.1
My main question is that after I have created a docker container for my mariadb with the command docker run --name db -e MYSQL_ROOT_PASSWORD=test -d -p 3306:3306 mariadb how can I access the sql db?
Somewhere I have seen a solution using a temporal (after exit the container is deleted) container, but cannot find it anymore.
I am searching for a command like: sudo docker exec -it [other flags] [command] db.
Just mysql-client, no extra docker container
Install the mysql client on your host,
apt-get install mysql-client
then use the following command to access your database container.
mysql -u<user> -p<pass> -h $(docker inspect --format '{{ .NetworkSettings.IPAddress }}' <db-container>)
The command will automatically get the IP of your docker container.
Make sure to replace <user>, <pass> and <db-container> with your respective values. In your case:
mysql -uroot -ptest -h $(docker inspect --format '{{ .NetworkSettings.IPAddress }}' db)
Your command lets mariadb run at the standard port 3306. If not, you have to tell the mysql command the new port.
from Official Mariadb website:
Connecting to MariaDB from Outside the Container
If we try to connect to the MariaDB server on localhost, the client will bypass networking and attempt to connect to the server using a socket file in the local filesystem. However, this doesn't work when MariaDB is running inside a container because the server's filesystem is isolated from the host. The client can't access the socket file which is inside the container, so it fails to connect.
Therefore connections to the MariaDB server must be made using TCP, even when the client is running on the same machine as the server container.
Most MariaDB images, including the official one, have external TCP connections disabled using the bind-address option in their #my.cnf# file. The docker image used in this guide is based on Ubuntu, so the file is located at /etc/mysql/my.cnf.
To use MariaDB we will need to edit the configuration file to change the appropriate option, and then restart the container.
Inside the container, edit the file my.cnf and check for the line that begins bind-address. Put a hash at the start of the line to comment it out:
#bind-address = 127.0.0.1
Save the file.
While still inside the container, send the shutdown command to MariaDB. This will shut down the server and also exit back out to the host:
mysqladmin -u root -p shutdown
Start the container again. This time the MariaDB server will have networking enabled:
docker start mariadbtest
Find the IP address that has been assigned to the container:
docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' mariadbtest
You can now connect to the MariaDB server using a TCP connection to that IP address.
Forcing a TCP Connection
After enabling network connections in MariaDB as described above, we will be able to connect to the server from outside the container.
On the host, run the client and set the server address ("-h") to the container's IP address that you found in the previous step:
mysql -h 172.17.0.2 -u root -p
This simple form of the connection should work in most situations. Depending on your configuration, it may also be necessary to specify the port for the server or to force TCP mode:
mysql -h 172.17.0.2 -P 3306 --protocol=TCP -u root -p
Port Configuration for Clustered Containers and Replication
Multiple MariaDB servers running in separate Docker containers can connect to each other using TCP. This is useful for forming a Galera cluster or for replication.
When running a cluster or a replication setup via Docker, we will want the containers to use different ports. The fastest way to achieve this is mapping the containers ports to different port on our system. We can do this when creating the containers (docker run command), by using the -p option, several times if necessary. For example, for Galera nodes we will use a mapping similar to this one:
-p 4306:3306 -p 5567:5567 -p 5444:5444 -p 5568:5568
First access the container terminal
docker exec -it some-mariadb bash
'some-mariadb' is the mysql container name
Then access the db directly using the mysql terminal command
mysql -u root -p
Connect to MariaDB from the MySQL command line client
The following command starts another mariadb container instance and runs the mysql command line client against your original mariadb container, allowing you to execute SQL statements against your database instance:
$ docker run -it --link some-mariadb:mysql --rm mariadb sh -c 'exec mysql -h"$MYSQL_PORT_3306_TCP_ADDR" -P"$MYSQL_PORT_3306_TCP_PORT" -uroot -p"$MYSQL_ENV_MYSQL_ROOT_PASSWORD"'
... where some-mariadb is the name of your original mariadb container.
More information about the MySQL command line client can be found in the MySQL documentation
Refer: https://hub.docker.com/_/mariadb/
Slightly different syntax, docker 18.05.0-ce on ubuntu 18.04:
sudo docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' db
I created my container like this:
$ docker run -d -p 33060:3306 myimage
Then I try connect from host to mysql server in container:
$ mysql -uroot -proot -P 33060
I got this error:
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
It odd because in Navicat only I changed the port and work fine:
But If I have the IP of the container:
$ docker inspect --format '{{ .NetworkSettings.IPAddress }}' mycontainer
172.17.0.55
Then I can connect to mysql server successfully:
$ mysql -uroot -proot -h 172.17.0.55
But it is a tedious task have to check the ip each time I create a new container to connect to mysql. There any settings I can do to make this task simpler?
This is not a Docker issue. By default the mysql command-line client will connect to a local (Unix) socket instead of a network one, even if you specify -P.
This behavior is described in the documentation:
On Unix, MySQL programs treat the host name localhost specially, in a way that is likely different from what you expect compared to other network-based programs. For connections to localhost, MySQL programs attempt to connect to the local server by using a Unix socket file. This occurs even if a --port or -P option is given
You have to pass the -hlocalhost option, or you can set your connection defaults in /etc/mysql/my.cnf