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10 Newer Entries Showing entries 61 to 70 of 79 9 Older Entries

Displaying posts with tag: configuration (reset)

Lost and Found ?
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Sometimes you just have to laugh at the crazy things that can kill a good evening. I had this brilliant idea to change our replication setup on one of our Master-Master replication server setups this week. I got sick of having to restart MySQL every time we wanted to add a new database and have it included in the list of replicated databases - we were using replicate-do-db in our configs.So it

Linux and open source no puff in the clouds
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UPDATED - I had to update this post after a conversation with RightScale founder and CTO Thorsten von Eicken and for Sun’s Open Cloud announcement, which are both now included below.

There has been some substantial technology and news regarding open source software in cloud computing lately. More proof that open source is reaching into nearly all aspects of enterprise and broader IT, and also reinforcement of the idea that open source software will continue to have a pervasive and disruptive impact on the way organizations of all shapes and sizes do their computing and deal with their data.

First up is RightScale, which as detailed by 451 colleague …

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MySQL User Group Meetings in Israel
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This is a short note that the MySQL User Group Meetings in Israel are established (well, re-established after a very long period).

Thanks to Eddy Resnick from Sun Microsystems Israel who has set up the meetings. So far, we’ve had 2 successful meetings, and we intend to have more! First one was in Sun’s offices in Herzlia; second one, held last week, was at Interbit (a MySQL training center) in Ramat Gan. We hope to hold these meetings on a monthly basis, and the next ones are expected to be held at Interbit.

A new (blessed) law in Israel forbids us from sending invitations for these …

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Concluded my first MySQL University Session about MySQL backups using file system snapshots - some questions remained unanswered...
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Today I gave my first MySQL University session as a speaker, talking about Backing up MySQL using file system snapshots. The talk went quite well (at least that was my impression) and we had ~10 people attending. The slides (PDF) and a recording of the session are …

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Manually installing multiple MySQL instances on Linux: HOWTO
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Installing a single MySQL instance on a linux machine is a very simple operation. It may be as simple as:

apt-get install mysql-server

But you cannot use this method to install another MySQL instance. Moreover, if you try to manually install another instance, you may find that some collisions occur.

For example, when trying to install two 5.0 servers, apt-get or yum will just tell me “package is already installed”.

When trying to install a new 5.1 server along with 5.0, an implicit upgrade is performed.

But even if we try forcing the installation, there are collisions:

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cmon 0.13 released
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The main fixes in cmon 0.13 are:

  • filtering of clusterlog
  • better graphs interface with filtering
  • fixed bug in load average graphs. Now the loadavg graphs works
  • added replication role, socket when adding a mysql server to be monitored from the web interface.
  • corrected bug with how often mysql_variables are collected
  • fixed problems with graphs
  • added images directory
  • revamped graphs - now producing files in images directory,
  • ajax support for Storage graphs

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MySQL security: data integrity issues
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MySQL’s security model is not as elaborate as other popular databases. It’s missing quite a lot.

I wish to point out what I think are some very disturbing security holes, which may affect the database integrity.

This post is not about Roles, Kerberos, IPs and such. It’s about simple MySQL features, which allow common, unprivileged users, to break data integrity by using unprotected session variables.

I will consider three such issues.

We will assume a database with two tables, and two users.

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Do we need sql_mode?
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sql_mode must be one of the most elusive issues in setting up a MySQL database. It is also responsible for difficulties in migration, upgrading and securing of databases.

MySQL usually has little issues with migrating database from one machine to another, one version to another, one OS to another, one architecture to another. If we’re not sure, we can always migrate using mysqldump’s logical dump, right?

Not entirely right. The elusive sql_mode (empty by default) may affect out backup+restore, may affect our application behavior, may affect our data integrity.

  • Did we remember to set NO_AUTO_CREATE_USER? Oh dear, we have some users without …
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MySQL Cluster Sandbox - test cluster to cluster replication!
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If you have max 15 minutes and want to try out MySQL Replication (geo redundancy) between two Clusters on your localhost (only tested on Linux) or on vmware then this Sandbox is for you.

Here is what you have to do:

  1. Go to
  2. Create a master cluster:
    I have used the ports 1186 (for the management server) and 3306 and 3307 for the mysql servers).

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cmon 0.12 - with diskdata support and a lot of fixes
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cmon 0.12 is now released and can be downloaded from

Release notes:

  • connection handling - cmon will now retry connects forever. cmon will also recover and automatically reconnect to cluster after a cluster failure or if the connection to the mysql server crashes where cmon logs information. This means you will have to terminate the cmon using e.g 'killall cmon' or /etc/init.d/cmon stop
  • disk data - cmon now gathers information about the amount of table space used and this is presented in the web interface …

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10 Newer Entries Showing entries 61 to 70 of 79 9 Older Entries

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