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Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist

Posted by: admin November 1, 2017 Leave a comment

Questions:

I am on a server that has afresh install on RHEL 5. I was able to install Apache and PHP just fine., but I am having serious trouble with my MySQL installation. I tried the following:

yum install mysql-server mysql 

And didn’t get any errors or conflicts. Then I tried to start mysql with the following commands:

chkconfig --levels 235 mysqld on
service mysqld start

And get Timeout error occurred trying to start MySQL Daemon.

I checked my logs and see this error:

[ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist

I’m not sure where to go from here.

For reference I am using RHEL 5 and installed the latest versions of PHP 5 and Apache.

Answers:
  1. Uninstall mysql using yum remove mysql*

  2. Recursively delete /usr/bin/mysql and /var/lib/mysql

  3. Delete the file /etc/my.cnf.rmp

  4. Use ps -e to check the processes to make sure mysql isn’t still running.

  5. Reboot server with reboot

  6. Run yum install mysql-server. This also seems to install the mysql client as a dependency.

  7. Give mysql ownership and group priveleges with:

    chown -R mysql /var/lib/mysql

    chgrp -R mysql /var/lib/mysql

  8. Use service mysqld start to start MySQL Daemon.

Questions:
Answers:

After chown and chgrp‘ing /var/lib/mysql per the answer by @Bad Programmer, you may also have to execute the following command:

sudo mysql_install_db –-user=mysql –ldata=/var/lib/mysql

Then restart your mysqld.

Questions:
Answers:

I had this issue on arch linux as well. The issue was pacman installed the package in a different location than MySQL was expecting. I was able to fix the issue with this:

sudo mysql_install_db --user=mysql --basedir=/usr/ --ldata=/var/lib/mysql/

Hope this helps someone!

Questions:
Answers:
mysql_install_db –-user=mysql –ldata=/var/lib/mysql

Worked for me in Centos 7

Questions:
Answers:

initialize mysql before start on windows.

mysqld --initialize

Questions:
Answers:

The root of my problem seemed to be selinux, which was turned on (enforcing)
automatically on OS install.

I wanted my mysql in /data.

After verifying that my.cnf had:

datadir=/data/mysql

(and leaving the socket at /var/lib/mysql)
I executed the command to turn off selinux for mysqld
(alternative is to turn it off completely):

setsebool -P mysqld_disable_trans=1

I ran the following commands:

> chown -R mysql .
> chgrp -R mysql .
> mysql_install_db --user=mysql

I started the mysql daemon and everything worked fine after that.

Questions:
Answers:

When download mysql zip version, if run mysqld directly, you’ll get this error:
2016-02-18T07:23:48.318481Z 0 [ERROR] Fatal error: Can’t open and lock privilege tables: Table ‘mysql.user’ doesn’t exist
2016-02-18T07:23:48.319482Z 0 [ERROR] Aborting

You have to run below command first:
mysqld –initialize

Make sure your data folder is empty before this command.

Questions:
Answers:

If you move your datadir, you not only need to give the new datadir permissions, but you need to ensure all parent directories have permission.

I moved my datadir to a hard drive, mounted in Ubuntu as:

/media/*user*/Data/

and my datadir was Databases.

I had to set permissions to 771 to each of the media, user and Data directories:

sudo chmod 771 *DIR*

If this does not work, another way you can get mysql to work is to change user in /etc/mysql/my.cnf to root; though there are no doubt some issues with doing that from a security perspective.

Questions:
Answers:

I just met the same problem with mysql 5.7 on OSX:

rm -rf {datadir}
mysqld --initialize --datadir {datadir}
mysqld --datadir {datadir}

Questions:
Answers:

For myself, I had to do:

yum remove mysql*

rm -rf /var/lib/mysql/
cp /etc/my.cnf ~/my.cnf.bkup

yum install -y mysql-server mysql-client

mysql_install_db

chown -R mysql:mysql /var/lib/mysql
chown -R mysql:mysql /var/log/mysql

service mysql start

Then I was able to get back into my databases and configure them again after I nuked them the first go around.

Questions:
Answers:

Just this command is enough to do the magic on centos 6.6

mysql_install_db

Questions:
Answers:

In my case the path of MySQL data folder had a special character “ç” and it make me get…

Fatal error: Can’t open and lock privilege tables: Table ‘mysql.host’
doesn’t exist.

I’m have removed all special characters and everything works.

Questions:
Answers:

On CentOS EL 6 and perhaps on earlier versions there is one way to get into this same mess.

Install CentOS EL6 with a minimal installation. For example I used kickstart to install the following:

%packages
@core
acpid
bison
cmake
dhcp-common
flex
gcc
gcc-c++
git
libaio-devel
make
man
ncurses-devel
perl
ntp
ntpdate
pciutils
tar
tcpdump
wget
%end

You will find that one of the dependencies of the above list is mysql-libs. I found that my system has a default my.cnf in /etc and this contains:

[mysqld]
dataddir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0

[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

When you build from the Generic Linux (Architecture Independent), Compressed TAR Archive your default data directory is /usr/local/mysql/data which conflicts with the /etc/my.cnf already present which defines datadir=/var/lib/mysql. Also the pid-file defined in the same file does not have permissions for the mysql user/group to write to it in /var/run/mysqld.

A quick remedy is to mv /etc/my.cnf /etc/my.cnf.old which should get your generic source procedure working.

Of course the experience is different of you use the source RPMs.

Questions:
Answers:

I had the same issue in trying to start the server and followed the “checked” solution.
But still had the problem. The issue was the my /etc/my.cnf file was not pointing to my
designated datadir as defined when I executed the mysql_install_db with –datadir defined. Once I updated this, the server started correctly.

Questions:
Answers:

If you have a server which used to happily run MySQL, but now gives this error, then an uninstall and re-install of MySQL is overkill.

In my case, the server died and took a few disk blocks with it. This affected a few files, including /var/lib/mysql/mysql/host.frm and /var/lib/mysql/mysql/proc.frm

Luckily, I could copy these from another server, and this got me past that table error.

Questions:
Answers:

My case on Ubuntu 14.04.2 LTS was similar to others with my.cnf, but for me the cause was a ~/.my.cnf that was leftover from a previous installation. After deleting that file and purging/re-installing mysql-server, it worked fine.