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+Setup
+=====
+
+The scripts apache2ctl, a2enmod, a2ensite, ... and the init script have some
+support for handling multiple instances of apache2 running on the same machine.
+
+The basic idea is to copy /etc/apache2 to /etc/apache2-xxx. An example script
+that demonstrates what else needs to be done can be found in
+/usr/share/doc/apache2/examples/setup-instance. Use with:
+
+ sh /usr/share/doc/apache2/examples/setup-instance xxx
+
+Adjust the configuration in /etc/apache2-xxx, especially the listen ports in
+ports.conf and in the virtual host directives in
+/etc/apache2-xxx/sites-enabled/*.
+
+You can then use a2enmod-xxx, apache2ctl-xxx, ... as usual, and they
+will affect the new instance of apache2.
+
+If you use systemd, the service name of your new instance is
+"apache2@xxx.service". Otherwise the script installed an init script
+named /etc/init.d/apache2-xxx.
+
+To start the new apache2 instance on boot, use
+- if you use systemd, run:
+ systemctl enable apache2@xxx
+- if you use sysv-init with dependency based boot sequence (the default):
+ If you don't have ssl keys with passphrases, you may want to set
+ 'X-Interactive: false' in /etc/init.d/apache2-xxx to reduce boot time.
+ Then execute:
+ insserv apache2-xxx
+- otherwise:
+ ln -s ../init.d/apache2-xxx /etc/rc2.d/S80apache2-xxx
+
+To make 'apache2ctl-xxx status' work, you need to set APACHE_STATUSURL in
+/etc/apache2-xxx/envvars.
+
+
+Upgrades
+========
+
+Since only the configuration files in /etc/apache2 are in the package, the
+configuration of other instances won't change if the default configuration
+changes. Possibly ways to deal with this are:
+
+- Use symlinks to the files in /etc/apache2 where possible instead of copying
+ the files.
+- Don't modify /etc/apache2 at all but use it to track the default
+ configuration. You can then merge the changes into the /etc/apache2-xxx dirs.
+ It may be a good idea to use a version control system for /etc/apache2 to
+ keep track of the changes. See the package etckeeper for keeping the whole
+ /etc dir under version control.
+ An advanced scheme may be for every /etc/apache2* dir to be a separate git
+ repository so that you can easily pull/push changes from one dir to another.
+
+
+Package removal
+===============
+
+The Apache 2 package will only remove the default configuration files and
+directories.
+
+
+htcacheclean service
+====================
+
+The apache-htcacheclean service can be handled in the same way as the
+main apache2 script. You can create an
+'apache-htcacheclean@instance.service' service under systemd or you can
+copy /etc/init.d/apache-htcacheclean as
+/etc/init.d/apache-htcacheclean-xxx under SystemV.
+
+The parameters of the service can be customized with
+/etc/default/apache-htcacheclean-xxx (that is created by the
+setup-instance helper script).
+
+
+Environment variables
+=====================
+
+The following environment variables can be used to influence many scripts. The
+default apache2 configuration will make use of them, too. Most can be set in
+/etc/apache2-xxx/envvars. Variables set in /etc/apache2-xxx/envvars must be
+exported.
+
+variable default value
+-------- -------------
+APACHE_CONFDIR /etc/apache2 or /etc/apache2-xxx
+APACHE_ENVVARS $APACHE_CONFDIR/envvars
+APACHE_HTTPD /usr/sbin/apache2
+APACHE_ARGUMENTS empty if $APACHE_CONFDIR = /etc/apache2
+ "-d $APACHE_CONFDIR" otherwise
+
+APACHE_RUN_USER www-data
+APACHE_RUN_GROUP www-data
+
+APACHE_PID_FILE /var/run/apache2/apache2.pid or /var/run/apache2-xxx/apache2.pid
+APACHE_RUN_DIR /var/run/apache2 or /var/run/apache2-xxx
+APACHE_LOCK_DIR /var/lock/apache2 or /var/lock/apache2-xxx
+APACHE_LOG_DIR /var/log/apache2 or /var/log/apache2-xxx
+
+APACHE_MODS_AVAILABLE $APACHE_CONFDIR/mods-available
+APACHE_MODS_ENABLED $APACHE_CONFDIR/mods-enabled
+APACHE_SITES_AVAILABLE $APACHE_CONFDIR/sites-available
+APACHE_SITES_ENABLED $APACHE_CONFDIR/sites-enabled
+
+APACHE_LYNX www-browser -dump
+APACHE_STATUSURL http://localhost:80/server-status