# ownCloud Server Administration Manual

# Server Tuning

There are a number of options to tune the ownCloud installation and enable a high level of performance. The database, for example, needs indexes in the most active tables. The number of live Apache connections needs to be turned up to 1000 or more, and the number of allowed MySQL connections also has to be increased to the same. Turning on the Alternative PHP Cache (APC) will also increase performance on the app servers, and there are likely a number of environment and policy specific configurations needed as well in any given deployment.

This chapter gives a few hands-on tips on how to achieve this.

## General Linux tuning

### System configuration overview

    # cat /etc/sysctl.conf
    ...
    net.core.somaxconn = 4096
    net.ipv4.tcp_max_syn_backlog = 2048
    ...
    # ulimit -nH 4096

Make sure that your `/tmp` is in ramdisk which improves session handling performance. To do so, add the following to `/etc/fstab`:

    none /tmp tmpfs,size=6g defaults

Make surethe APC byte code cache is installed:

    # yum install php-pecl-apc

mysql temp in ramdisk

### Tuning System Parameters

Configuration for more concurrent requests.

    echo "2048 64512" > /proc/sys/net/ipv4/ip_local_port_range
    echo "1" > /proc/sys/net/ipv4/tcp_tw_recycle
    echo "1" > /proc/sys/net/ipv4/tcp_tw_reuse
    echo "10" > /proc/sys/net/ipv4/tcp_fin_timeout

    echo "65536" > /proc/sys/net/core/somaxconn
    echo "65536" > /proc/sys/net/ipv4/tcp_max_syn_backlog
    echo "262144" > /proc/sys/net/netfilter/nf_conntrack_max

Check if the values have been set accordingly:

    # cat /proc/sys/net/ipv4/ip_local_port_range
    2048 64512
    # cat /proc/sys/net/ipv4/tcp_tw_recycle
    1
    # cat /proc/sys/net/ipv4/tcp_tw_reuse
    1
    # cat /proc/sys/net/ipv4/tcp_fin_timeout
    10
    # cat /proc/sys/net/core/somaxconn
    65536
    # cat /proc/sys/net/ipv4/tcp_max_syn_backlog
    65536
    # cat /proc/sys/net/netfilter/nf_conntrack_max
    262144

Next, persist the settings across reboots by adding them into `/etc/sysctl.conf`:

    net.ipv4.ip_local_port_range = 2048 64512
    net.ipv4.tcp_tw_recycle = 1
    net.ipv4.tcp_tw_reuse = 1
    net.ipv4.tcp_fin_timeout = 10

    net.core.somaxconn = 65536
    net.ipv4.tcp_max_syn_backlog = 65536
    net.netfilter.nf_conntrack_max = 262144

### Tuning

Add RAM disk to fstab:

    - none /var/www/html tmpfs defaults,size=6g

Move PHP Code into RAM Disk:

    # mv /var/www/html /var/www/html_fs

Copy ownCloud installation to RAM Disk and symlink storage to ownCloud `data` directory.

Note

ram disks are not reboot-safe. You need to establish a way to persist them, for instance by using `cp` or `rsync` to transfer them from a location on the hard disk to the ram disk before apache starts.

## Apache Tuning

### Maximum number Apache processes

An apache process is using around 12MB of RAM. Apache should be configured that the maximum number of httpd processes time 12MB is lower than the amount of RAM. Otherwise the system begins to swap and the performance goes down. In this case the maximum number is set to 6000

### KeepAlive should be configured with sensible defaults

    KeepAlive On
    KeepAliveTimeout 2
    MaxKeepAliveRequests 10

### mod_gzip

mod_gzip should be used because it speeds up the transfer of data and helps to free server memory and http connections are closed faster.

### php safe mode

php safe mode has to be turned off. It is deprecated and will be removed in newer PHP versions.

#### MPM

Apache prefork has to be used. Don’t use threaded mpm with mod_php because php is currently not thread safe.

### Hostname Lookups

    # cat /etc/httpd/conf/httpd.conf
    ...
    HostnameLookups off
    ...

### Log files

Log files should be switched off for maximum performance.

Comment out the CustomLog` directive. Keep `ErrorLog` to be able to track down errors.

### MaxKeepAliveRequests 4096

    <IfModule prefork.c>
            StartServers 100
            MinSpareServers 100
            MaxSpareServers 2000
            ServerLimit 6000
            MaxClients 6000
            MaxRequestsPerChild 4000
    </IfModule>

    <Directory "/var/www/html">
            Options Indexes SymLinksIfOwnerMatch AllowOverride All
    </Directory>

## Database Best Practice

Currently ownCloud supports the following relational database management systems:

- mysql
- mariadb
- postgresql
- oracle
- mssql

We are using the doctrine database abstraction layer and schema evolution with a MDB2 Schema based table description in XML.

The default indexes are chosen to support every day usage. Additional indexes might further improve the performance.

### MySQL / MariaDB

#### Usage scenario

Is the recommended setup. Well tested.

#### Additional Indexes

Index on uid in oc_group_user:

    create index oc_group_user_uid on oc_group_user(uid);

Index on oc_share:

    create index oc_share_file_target on oc_share(file_target);

Index on oc_filecache:

    create index oc_filepath on oc_filecache(storage,size);

Index on oc_files_versions:

    create index oc_files_versions_user  on oc_files_versions(user);

Index on oc_files_trashsize:

    create index oc_files_trashsize_user  on oc_files_trashsize(user);

Progress of adding them to the default code is tracked in https://github.com/owncloud/core/issues/7474.

#### Other performance improvements

Mysql: compare https://tools.percona.com/wizard to your current settings MariaDB: https://mariadb.com/kb/en/optimization-and-tuning/

### Postgresql

#### Usage scenario

Alternative to mysql. Used in production by a few core developers.

#### Migration

Requires at least Postgresql 9.0

#### Additional Indexes

The ones from mysql should work just fine. Progress of adding them to the default code is tracked in https://github.com/owncloud/core/issues/7474.

#### Other performance improvements

See http://wiki.postgresql.org/wiki/Performance_Optimization

#### Additional Indexes

The ones from mysql should work just fine. Progress of adding them to the default code is tracked in https://github.com/owncloud/core/issues/7474.

### Oracle Database

#### Usage scenario

Existing enterprise installations. Only core apps are supported and tested. Not recommended because it involves compiling the oci8

#### Additional Indexes

The ones from mysql should work just fine. Progress of adding them to the default code is tracked in https://github.com/owncloud/core/issues/7474.

#### Other performance improvements

http://de.slideshare.net/cjorcl/best-practices-php-and-the-oracle-database and ask your DBA.

#### Problems

When ORA-56600 occurs (Oracle Bug 8467564) set this php.ini setting: oci8.statement_cache_size=1000, see oracle forum discussion

### Microsoft SQL Server

#### Usage scenario

Only core apps are supported. Not even tested by jenkins.

#### Additional Indexes

The ones from mysql should work just fine. Progress of adding them to the default code is tracked in https://github.com/owncloud/core/issues/7474.

#### Other performance improvements

http://www.mssqltips.com/sql-server-tip-category/9/performance-tuning/