diff --git a/.config/htconfig.php b/.config/htconfig.php
index ccd86da..4b67aa8 100644
--- a/.config/htconfig.php
+++ b/.config/htconfig.php
@@ -110,4 +110,28 @@ $a->config['system']['auth_cookie_lifetime'] = 7;
 if (!empty(getenv('VALIDATION'))) {
 	$a->config['system']['disable_url_validation'] = strtolower(getenv('VALIDATION'));
 	$a->config['system']['disable_email_validation'] = strtolower(getenv('VALIDATION'));
+}
+
+if (!empty(getenv('CACHE_DRIVER'))) {
+	$a->config['system']['cache_driver'] = strtolower(getenv('CACHE_DRIVER'));
+
+	if (!empty(getenv('REDIS_HOST'))) {
+		$a->config['system']['redis_host'] = getenv('REDIS_HOST');
+	}
+
+	if (!empty(getenv('REDIS_PORT'))) {
+		$a->config['system']['redis_port'] = getenv('REDIS_PORT');
+	}
+
+	if (!empty(getenv('MEMCACHE_HOST'))) {
+		$a->config['system']['memcache_host'] = getenv('MEMCACHE_HOST');
+	}
+
+	if (!empty(getenv('MEMCACHE_PORT'))) {
+		$a->config['system']['memcache_port'] = getenv('MEMCACHE_PORT');
+	}
+
+	if (!empty(getenv('MEMCACHED_HOSTS'))) {
+		$a->config['system']['memcached_hosts'] = getenv('MEMCACHED_HOSTS');
+	}
 }
\ No newline at end of file
diff --git a/.examples/docker-compose/insecure/mariadb-cron/apache/db.env b/.examples/docker-compose/insecure/mariadb-cron-redis/apache/db.env
similarity index 100%
rename from .examples/docker-compose/insecure/mariadb-cron/apache/db.env
rename to .examples/docker-compose/insecure/mariadb-cron-redis/apache/db.env
diff --git a/.examples/docker-compose/insecure/mariadb-cron/apache/docker-compose.yml b/.examples/docker-compose/insecure/mariadb-cron-redis/apache/docker-compose.yml
similarity index 79%
rename from .examples/docker-compose/insecure/mariadb-cron/apache/docker-compose.yml
rename to .examples/docker-compose/insecure/mariadb-cron-redis/apache/docker-compose.yml
index 779e0d4..9269cbb 100644
--- a/.examples/docker-compose/insecure/mariadb-cron/apache/docker-compose.yml
+++ b/.examples/docker-compose/insecure/mariadb-cron-redis/apache/docker-compose.yml
@@ -11,6 +11,10 @@ services:
     env_file:
       - db.env
 
+  redis:
+    image: redis
+    restart: always
+
   app:
     image: friendica/server:apache
     restart: always
@@ -18,6 +22,8 @@ services:
       - friendica:/var/www/html
     environment:
       - AUTOINSTALL=true
+      - CACHE_DRIVER=redis
+      - REDIS_HOST=redis
       - MAILNAME=
       - TZ=
       - LANGUAGE=
@@ -37,6 +43,8 @@ services:
       - friendica:/var/www/html
     entrypoint: /cron.sh
     environment:
+      - CACHE_DRIVER=redis
+      - REDIS_HOST=redis
       - MAILNAME=
       - TZ=
       - LANGUAGE=
diff --git a/.examples/docker-compose/insecure/mariadb-cron/fpm-alpine/db.env b/.examples/docker-compose/insecure/mariadb-cron-redis/fpm-alpine/db.env
similarity index 100%
rename from .examples/docker-compose/insecure/mariadb-cron/fpm-alpine/db.env
rename to .examples/docker-compose/insecure/mariadb-cron-redis/fpm-alpine/db.env
diff --git a/.examples/docker-compose/insecure/mariadb-cron/fpm-alpine/docker-compose.yml b/.examples/docker-compose/insecure/mariadb-cron-redis/fpm-alpine/docker-compose.yml
similarity index 81%
rename from .examples/docker-compose/insecure/mariadb-cron/fpm-alpine/docker-compose.yml
rename to .examples/docker-compose/insecure/mariadb-cron-redis/fpm-alpine/docker-compose.yml
index e7ebf1f..225ec8f 100644
--- a/.examples/docker-compose/insecure/mariadb-cron/fpm-alpine/docker-compose.yml
+++ b/.examples/docker-compose/insecure/mariadb-cron-redis/fpm-alpine/docker-compose.yml
@@ -11,6 +11,10 @@ services:
     env_file:
       - db.env
 
+  redis:
+    image: redis
+    restart: always
+
   app:
     image: friendica/server:fpm-alpine
     restart: always
@@ -18,6 +22,8 @@ services:
       - friendica:/var/www/html
     environment:
       - AUTOINSTALL=true
+      - CACHE_DRIVER=redis
+      - REDIS_HOST=redis
       - MAILNAME=
       - TZ=
       - LANGUAGE=
@@ -35,6 +41,8 @@ services:
       - friendica:/var/www/html
     entrypoint: /cron.sh
     environment:
+      - CACHE_DRIVER=redis
+      - REDIS_HOST=redis
       - MAILNAME=
       - TZ=
       - LANGUAGE=
diff --git a/.examples/docker-compose/insecure/mariadb-cron/fpm-alpine/web/nginx.conf b/.examples/docker-compose/insecure/mariadb-cron-redis/fpm-alpine/web/nginx.conf
similarity index 100%
rename from .examples/docker-compose/insecure/mariadb-cron/fpm-alpine/web/nginx.conf
rename to .examples/docker-compose/insecure/mariadb-cron-redis/fpm-alpine/web/nginx.conf
diff --git a/.examples/docker-compose/insecure/mariadb-cron/fpm/db.env b/.examples/docker-compose/insecure/mariadb-cron-redis/fpm/db.env
similarity index 100%
rename from .examples/docker-compose/insecure/mariadb-cron/fpm/db.env
rename to .examples/docker-compose/insecure/mariadb-cron-redis/fpm/db.env
diff --git a/.examples/docker-compose/insecure/mariadb-cron/fpm/docker-compose.yml b/.examples/docker-compose/insecure/mariadb-cron-redis/fpm/docker-compose.yml
similarity index 81%
rename from .examples/docker-compose/insecure/mariadb-cron/fpm/docker-compose.yml
rename to .examples/docker-compose/insecure/mariadb-cron-redis/fpm/docker-compose.yml
index 8a0f66f..a165ea5 100644
--- a/.examples/docker-compose/insecure/mariadb-cron/fpm/docker-compose.yml
+++ b/.examples/docker-compose/insecure/mariadb-cron-redis/fpm/docker-compose.yml
@@ -11,6 +11,10 @@ services:
     env_file:
       - db.env
 
+  redis:
+    image: redis
+    restart: always
+
   app:
     image: friendica/server:fpm
     restart: always
@@ -18,6 +22,8 @@ services:
       - friendica:/var/www/html
     environment:
       - AUTOINSTALL=true
+      - CACHE_DRIVER=redis
+      - REDIS_HOST=redis
       - MAILNAME=
       - TZ=
       - LANGUAGE=
@@ -34,6 +40,8 @@ services:
       - friendica:/var/www/html
     entrypoint: /cron.sh
     environment:
+      - CACHE_DRIVER=redis
+      - REDIS_HOST=redis
       - MAILNAME=
       - TZ=
       - LANGUAGE=
diff --git a/.examples/docker-compose/insecure/mariadb-cron/fpm/web/nginx.conf b/.examples/docker-compose/insecure/mariadb-cron-redis/fpm/web/nginx.conf
similarity index 100%
rename from .examples/docker-compose/insecure/mariadb-cron/fpm/web/nginx.conf
rename to .examples/docker-compose/insecure/mariadb-cron-redis/fpm/web/nginx.conf
diff --git a/2018.05/apache/Dockerfile b/2018.05/apache/Dockerfile
index 8f6f7f0..79bd022 100644
--- a/2018.05/apache/Dockerfile
+++ b/2018.05/apache/Dockerfile
@@ -38,6 +38,7 @@ RUN set -ex; \
         libmcrypt-dev \
         imagemagick \
         libmagick++-dev \
+        libmemcached-dev \
         libgraphicsmagick1-dev \
         libfreetype6 \
         libfreetype6-dev \
@@ -60,6 +61,15 @@ RUN set -ex; \
     ; \
     docker-php-ext-install -j 4 curl pdo pdo_mysql xml gd zip opcache mbstring posix ctype json iconv mcrypt \
     ; \
+# pecl will claim success even if one install fails, so we need to perform each install separately
+    pecl install memcached-3.0.4; \
+    pecl install redis-3.1.6; \
+    \
+    docker-php-ext-enable \
+        memcached \
+        redis \
+    ; \
+    \
 # reset apt-mark's "manual" list so that "purge --auto-remove" will remove all build dependencies
     apt-mark auto '.*' > /dev/null; \
     apt-mark manual $savedAptMark; \
diff --git a/2018.05/apache/config/htconfig.php b/2018.05/apache/config/htconfig.php
index ccd86da..4b67aa8 100644
--- a/2018.05/apache/config/htconfig.php
+++ b/2018.05/apache/config/htconfig.php
@@ -110,4 +110,28 @@ $a->config['system']['auth_cookie_lifetime'] = 7;
 if (!empty(getenv('VALIDATION'))) {
 	$a->config['system']['disable_url_validation'] = strtolower(getenv('VALIDATION'));
 	$a->config['system']['disable_email_validation'] = strtolower(getenv('VALIDATION'));
+}
+
+if (!empty(getenv('CACHE_DRIVER'))) {
+	$a->config['system']['cache_driver'] = strtolower(getenv('CACHE_DRIVER'));
+
+	if (!empty(getenv('REDIS_HOST'))) {
+		$a->config['system']['redis_host'] = getenv('REDIS_HOST');
+	}
+
+	if (!empty(getenv('REDIS_PORT'))) {
+		$a->config['system']['redis_port'] = getenv('REDIS_PORT');
+	}
+
+	if (!empty(getenv('MEMCACHE_HOST'))) {
+		$a->config['system']['memcache_host'] = getenv('MEMCACHE_HOST');
+	}
+
+	if (!empty(getenv('MEMCACHE_PORT'))) {
+		$a->config['system']['memcache_port'] = getenv('MEMCACHE_PORT');
+	}
+
+	if (!empty(getenv('MEMCACHED_HOSTS'))) {
+		$a->config['system']['memcached_hosts'] = getenv('MEMCACHED_HOSTS');
+	}
 }
\ No newline at end of file
diff --git a/2018.05/fpm-alpine/Dockerfile b/2018.05/fpm-alpine/Dockerfile
index a50eec8..5123160 100644
--- a/2018.05/fpm-alpine/Dockerfile
+++ b/2018.05/fpm-alpine/Dockerfile
@@ -31,6 +31,8 @@ RUN set -ex; \
         libtool \
         libmcrypt \
         libmcrypt-dev \
+        libmemcached-dev \
+        cyrus-sasl-dev \
         freetype \
         libpng \
         libjpeg-turbo-dev \
@@ -55,6 +57,15 @@ RUN set -ex; \
     ; \
     docker-php-ext-install -j 4 curl pdo pdo_mysql xml gd zip opcache mbstring posix ctype json iconv mcrypt; \
     \
+# pecl will claim success even if one install fails, so we need to perform each install separately
+    pecl install memcached-3.0.4; \
+    pecl install redis-3.1.6; \
+    \
+    docker-php-ext-enable \
+        memcached \
+        redis \
+    ; \
+    \
     runDeps="$( \
       scanelf --needed --nobanner --format '%n#p' --recursive /usr/local/lib/php/extensions \
           | tr ',' '\n' \
diff --git a/2018.05/fpm-alpine/config/htconfig.php b/2018.05/fpm-alpine/config/htconfig.php
index ccd86da..4b67aa8 100644
--- a/2018.05/fpm-alpine/config/htconfig.php
+++ b/2018.05/fpm-alpine/config/htconfig.php
@@ -110,4 +110,28 @@ $a->config['system']['auth_cookie_lifetime'] = 7;
 if (!empty(getenv('VALIDATION'))) {
 	$a->config['system']['disable_url_validation'] = strtolower(getenv('VALIDATION'));
 	$a->config['system']['disable_email_validation'] = strtolower(getenv('VALIDATION'));
+}
+
+if (!empty(getenv('CACHE_DRIVER'))) {
+	$a->config['system']['cache_driver'] = strtolower(getenv('CACHE_DRIVER'));
+
+	if (!empty(getenv('REDIS_HOST'))) {
+		$a->config['system']['redis_host'] = getenv('REDIS_HOST');
+	}
+
+	if (!empty(getenv('REDIS_PORT'))) {
+		$a->config['system']['redis_port'] = getenv('REDIS_PORT');
+	}
+
+	if (!empty(getenv('MEMCACHE_HOST'))) {
+		$a->config['system']['memcache_host'] = getenv('MEMCACHE_HOST');
+	}
+
+	if (!empty(getenv('MEMCACHE_PORT'))) {
+		$a->config['system']['memcache_port'] = getenv('MEMCACHE_PORT');
+	}
+
+	if (!empty(getenv('MEMCACHED_HOSTS'))) {
+		$a->config['system']['memcached_hosts'] = getenv('MEMCACHED_HOSTS');
+	}
 }
\ No newline at end of file
diff --git a/2018.05/fpm/Dockerfile b/2018.05/fpm/Dockerfile
index 55651fc..23ce007 100644
--- a/2018.05/fpm/Dockerfile
+++ b/2018.05/fpm/Dockerfile
@@ -38,6 +38,7 @@ RUN set -ex; \
         libmcrypt-dev \
         imagemagick \
         libmagick++-dev \
+        libmemcached-dev \
         libgraphicsmagick1-dev \
         libfreetype6 \
         libfreetype6-dev \
@@ -60,6 +61,15 @@ RUN set -ex; \
     ; \
     docker-php-ext-install -j 4 curl pdo pdo_mysql xml gd zip opcache mbstring posix ctype json iconv mcrypt \
     ; \
+# pecl will claim success even if one install fails, so we need to perform each install separately
+    pecl install memcached-3.0.4; \
+    pecl install redis-3.1.6; \
+    \
+    docker-php-ext-enable \
+        memcached \
+        redis \
+    ; \
+    \
 # reset apt-mark's "manual" list so that "purge --auto-remove" will remove all build dependencies
     apt-mark auto '.*' > /dev/null; \
     apt-mark manual $savedAptMark; \
diff --git a/2018.05/fpm/config/htconfig.php b/2018.05/fpm/config/htconfig.php
index ccd86da..4b67aa8 100644
--- a/2018.05/fpm/config/htconfig.php
+++ b/2018.05/fpm/config/htconfig.php
@@ -110,4 +110,28 @@ $a->config['system']['auth_cookie_lifetime'] = 7;
 if (!empty(getenv('VALIDATION'))) {
 	$a->config['system']['disable_url_validation'] = strtolower(getenv('VALIDATION'));
 	$a->config['system']['disable_email_validation'] = strtolower(getenv('VALIDATION'));
+}
+
+if (!empty(getenv('CACHE_DRIVER'))) {
+	$a->config['system']['cache_driver'] = strtolower(getenv('CACHE_DRIVER'));
+
+	if (!empty(getenv('REDIS_HOST'))) {
+		$a->config['system']['redis_host'] = getenv('REDIS_HOST');
+	}
+
+	if (!empty(getenv('REDIS_PORT'))) {
+		$a->config['system']['redis_port'] = getenv('REDIS_PORT');
+	}
+
+	if (!empty(getenv('MEMCACHE_HOST'))) {
+		$a->config['system']['memcache_host'] = getenv('MEMCACHE_HOST');
+	}
+
+	if (!empty(getenv('MEMCACHE_PORT'))) {
+		$a->config['system']['memcache_port'] = getenv('MEMCACHE_PORT');
+	}
+
+	if (!empty(getenv('MEMCACHED_HOSTS'))) {
+		$a->config['system']['memcached_hosts'] = getenv('MEMCACHED_HOSTS');
+	}
 }
\ No newline at end of file
diff --git a/2018.08-dev/apache/Dockerfile b/2018.08-dev/apache/Dockerfile
index 5669ba1..95e353f 100644
--- a/2018.08-dev/apache/Dockerfile
+++ b/2018.08-dev/apache/Dockerfile
@@ -38,6 +38,7 @@ RUN set -ex; \
         libmcrypt-dev \
         imagemagick \
         libmagick++-dev \
+        libmemcached-dev \
         libgraphicsmagick1-dev \
         libfreetype6 \
         libfreetype6-dev \
@@ -60,6 +61,15 @@ RUN set -ex; \
     ; \
     docker-php-ext-install -j 4 curl pdo pdo_mysql xml gd zip opcache mbstring posix ctype json iconv mcrypt \
     ; \
+# pecl will claim success even if one install fails, so we need to perform each install separately
+    pecl install memcached-3.0.4; \
+    pecl install redis-3.1.6; \
+    \
+    docker-php-ext-enable \
+        memcached \
+        redis \
+    ; \
+    \
 # reset apt-mark's "manual" list so that "purge --auto-remove" will remove all build dependencies
     apt-mark auto '.*' > /dev/null; \
     apt-mark manual $savedAptMark; \
diff --git a/2018.08-dev/apache/config/htconfig.php b/2018.08-dev/apache/config/htconfig.php
index ccd86da..4b67aa8 100644
--- a/2018.08-dev/apache/config/htconfig.php
+++ b/2018.08-dev/apache/config/htconfig.php
@@ -110,4 +110,28 @@ $a->config['system']['auth_cookie_lifetime'] = 7;
 if (!empty(getenv('VALIDATION'))) {
 	$a->config['system']['disable_url_validation'] = strtolower(getenv('VALIDATION'));
 	$a->config['system']['disable_email_validation'] = strtolower(getenv('VALIDATION'));
+}
+
+if (!empty(getenv('CACHE_DRIVER'))) {
+	$a->config['system']['cache_driver'] = strtolower(getenv('CACHE_DRIVER'));
+
+	if (!empty(getenv('REDIS_HOST'))) {
+		$a->config['system']['redis_host'] = getenv('REDIS_HOST');
+	}
+
+	if (!empty(getenv('REDIS_PORT'))) {
+		$a->config['system']['redis_port'] = getenv('REDIS_PORT');
+	}
+
+	if (!empty(getenv('MEMCACHE_HOST'))) {
+		$a->config['system']['memcache_host'] = getenv('MEMCACHE_HOST');
+	}
+
+	if (!empty(getenv('MEMCACHE_PORT'))) {
+		$a->config['system']['memcache_port'] = getenv('MEMCACHE_PORT');
+	}
+
+	if (!empty(getenv('MEMCACHED_HOSTS'))) {
+		$a->config['system']['memcached_hosts'] = getenv('MEMCACHED_HOSTS');
+	}
 }
\ No newline at end of file
diff --git a/2018.08-dev/fpm-alpine/Dockerfile b/2018.08-dev/fpm-alpine/Dockerfile
index a25dac5..2723c60 100644
--- a/2018.08-dev/fpm-alpine/Dockerfile
+++ b/2018.08-dev/fpm-alpine/Dockerfile
@@ -31,6 +31,8 @@ RUN set -ex; \
         libtool \
         libmcrypt \
         libmcrypt-dev \
+        libmemcached-dev \
+        cyrus-sasl-dev \
         freetype \
         libpng \
         libjpeg-turbo-dev \
@@ -55,6 +57,15 @@ RUN set -ex; \
     ; \
     docker-php-ext-install -j 4 curl pdo pdo_mysql xml gd zip opcache mbstring posix ctype json iconv mcrypt; \
     \
+# pecl will claim success even if one install fails, so we need to perform each install separately
+    pecl install memcached-3.0.4; \
+    pecl install redis-3.1.6; \
+    \
+    docker-php-ext-enable \
+        memcached \
+        redis \
+    ; \
+    \
     runDeps="$( \
       scanelf --needed --nobanner --format '%n#p' --recursive /usr/local/lib/php/extensions \
           | tr ',' '\n' \
diff --git a/2018.08-dev/fpm-alpine/config/htconfig.php b/2018.08-dev/fpm-alpine/config/htconfig.php
index ccd86da..4b67aa8 100644
--- a/2018.08-dev/fpm-alpine/config/htconfig.php
+++ b/2018.08-dev/fpm-alpine/config/htconfig.php
@@ -110,4 +110,28 @@ $a->config['system']['auth_cookie_lifetime'] = 7;
 if (!empty(getenv('VALIDATION'))) {
 	$a->config['system']['disable_url_validation'] = strtolower(getenv('VALIDATION'));
 	$a->config['system']['disable_email_validation'] = strtolower(getenv('VALIDATION'));
+}
+
+if (!empty(getenv('CACHE_DRIVER'))) {
+	$a->config['system']['cache_driver'] = strtolower(getenv('CACHE_DRIVER'));
+
+	if (!empty(getenv('REDIS_HOST'))) {
+		$a->config['system']['redis_host'] = getenv('REDIS_HOST');
+	}
+
+	if (!empty(getenv('REDIS_PORT'))) {
+		$a->config['system']['redis_port'] = getenv('REDIS_PORT');
+	}
+
+	if (!empty(getenv('MEMCACHE_HOST'))) {
+		$a->config['system']['memcache_host'] = getenv('MEMCACHE_HOST');
+	}
+
+	if (!empty(getenv('MEMCACHE_PORT'))) {
+		$a->config['system']['memcache_port'] = getenv('MEMCACHE_PORT');
+	}
+
+	if (!empty(getenv('MEMCACHED_HOSTS'))) {
+		$a->config['system']['memcached_hosts'] = getenv('MEMCACHED_HOSTS');
+	}
 }
\ No newline at end of file
diff --git a/2018.08-dev/fpm/Dockerfile b/2018.08-dev/fpm/Dockerfile
index de0f5ab..32177c7 100644
--- a/2018.08-dev/fpm/Dockerfile
+++ b/2018.08-dev/fpm/Dockerfile
@@ -38,6 +38,7 @@ RUN set -ex; \
         libmcrypt-dev \
         imagemagick \
         libmagick++-dev \
+        libmemcached-dev \
         libgraphicsmagick1-dev \
         libfreetype6 \
         libfreetype6-dev \
@@ -60,6 +61,15 @@ RUN set -ex; \
     ; \
     docker-php-ext-install -j 4 curl pdo pdo_mysql xml gd zip opcache mbstring posix ctype json iconv mcrypt \
     ; \
+# pecl will claim success even if one install fails, so we need to perform each install separately
+    pecl install memcached-3.0.4; \
+    pecl install redis-3.1.6; \
+    \
+    docker-php-ext-enable \
+        memcached \
+        redis \
+    ; \
+    \
 # reset apt-mark's "manual" list so that "purge --auto-remove" will remove all build dependencies
     apt-mark auto '.*' > /dev/null; \
     apt-mark manual $savedAptMark; \
diff --git a/2018.08-dev/fpm/config/htconfig.php b/2018.08-dev/fpm/config/htconfig.php
index ccd86da..4b67aa8 100644
--- a/2018.08-dev/fpm/config/htconfig.php
+++ b/2018.08-dev/fpm/config/htconfig.php
@@ -110,4 +110,28 @@ $a->config['system']['auth_cookie_lifetime'] = 7;
 if (!empty(getenv('VALIDATION'))) {
 	$a->config['system']['disable_url_validation'] = strtolower(getenv('VALIDATION'));
 	$a->config['system']['disable_email_validation'] = strtolower(getenv('VALIDATION'));
+}
+
+if (!empty(getenv('CACHE_DRIVER'))) {
+	$a->config['system']['cache_driver'] = strtolower(getenv('CACHE_DRIVER'));
+
+	if (!empty(getenv('REDIS_HOST'))) {
+		$a->config['system']['redis_host'] = getenv('REDIS_HOST');
+	}
+
+	if (!empty(getenv('REDIS_PORT'))) {
+		$a->config['system']['redis_port'] = getenv('REDIS_PORT');
+	}
+
+	if (!empty(getenv('MEMCACHE_HOST'))) {
+		$a->config['system']['memcache_host'] = getenv('MEMCACHE_HOST');
+	}
+
+	if (!empty(getenv('MEMCACHE_PORT'))) {
+		$a->config['system']['memcache_port'] = getenv('MEMCACHE_PORT');
+	}
+
+	if (!empty(getenv('MEMCACHED_HOSTS'))) {
+		$a->config['system']['memcached_hosts'] = getenv('MEMCACHED_HOSTS');
+	}
 }
\ No newline at end of file
diff --git a/Dockerfile-alpine.template b/Dockerfile-alpine.template
index f66e763..936115a 100644
--- a/Dockerfile-alpine.template
+++ b/Dockerfile-alpine.template
@@ -30,6 +30,8 @@ RUN set -ex; \
         libtool \
         libmcrypt \
         libmcrypt-dev \
+        libmemcached-dev \
+        cyrus-sasl-dev \
         freetype \
         libpng \
         libjpeg-turbo-dev \
@@ -54,6 +56,15 @@ RUN set -ex; \
     ; \
     docker-php-ext-install -j 4 curl pdo pdo_mysql xml gd zip opcache mbstring posix ctype json iconv mcrypt; \
     \
+# pecl will claim success even if one install fails, so we need to perform each install separately
+    pecl install memcached-%%MEMCACHED_VERSION%%; \
+    pecl install redis-%%REDIS_VERSION%%; \
+    \
+    docker-php-ext-enable \
+        memcached \
+        redis \
+    ; \
+    \
     runDeps="$( \
       scanelf --needed --nobanner --format '%n#p' --recursive /usr/local/lib/php/extensions \
           | tr ',' '\n' \
diff --git a/Dockerfile-debian.template b/Dockerfile-debian.template
index 4ad1e58..05e1764 100644
--- a/Dockerfile-debian.template
+++ b/Dockerfile-debian.template
@@ -37,6 +37,7 @@ RUN set -ex; \
         libmcrypt-dev \
         imagemagick \
         libmagick++-dev \
+        libmemcached-dev \
         libgraphicsmagick1-dev \
         libfreetype6 \
         libfreetype6-dev \
@@ -59,6 +60,15 @@ RUN set -ex; \
     ; \
     docker-php-ext-install -j 4 curl pdo pdo_mysql xml gd zip opcache mbstring posix ctype json iconv mcrypt \
     ; \
+# pecl will claim success even if one install fails, so we need to perform each install separately
+    pecl install memcached-%%MEMCACHED_VERSION%%; \
+    pecl install redis-%%REDIS_VERSION%%; \
+    \
+    docker-php-ext-enable \
+        memcached \
+        redis \
+    ; \
+    \
 # reset apt-mark's "manual" list so that "purge --auto-remove" will remove all build dependencies
     apt-mark auto '.*' > /dev/null; \
     apt-mark manual $savedAptMark; \
diff --git a/README.md b/README.md
index a865128..9cd0fb3 100644
--- a/README.md
+++ b/README.md
@@ -69,19 +69,19 @@ There are three options to enable the cron-job for Friendica:
 This is the full list of all possible environment variables used for this image:
 
 **Common**
--	`MAILNAME` E-Mail address of the administrator (**required**)
--	`TZ` The default localization of the Friendica server (Default: `America/Los_Angeles`)
--	`LANGUAGE` The default language of the Friendica server (Default: `en`)
--	`SITENAME` The default name of the Friendica server (Default: `Friendica Social Network` )
--	`VALIDATION` The default setting if url/emails are getting validated (Default: `true`)
--	`AUTOINSTALL` if `true`, the automatic configuration will start (Default: `false`)
+-	`MAILNAME` E-Mail address of the administrator. (**required**)
+-	`TZ` The default localization of the Friendica server. (Default: `America/Los_Angeles`)
+-	`LANGUAGE` The default language of the Friendica server. (Default: `en`)
+-	`SITENAME` The default name of the Friendica server. (Default: `Friendica Social Network` )
+-	`VALIDATION` The default setting if url/emails are getting validated. (Default: `true`)
+-	`AUTOINSTALL` if `true`, the automatic configuration will start. (Default: `false`)
 
 **SMTP/Mail** 
--	`SMTP` address of the SMTP Mail-Gateway (**required** - Default: `localhost`)
--	`SMTP_FROM` sender user-part of the address (Default: `no-reply` - e.g. no-reply@friendica.local)
--	`SMTP_AUTH_USER` Username for the SMTP Mail-Gateway (Default: empty)
--	`SMTP_AUTH_PASS` Password for the SMTP Mail-Gateway (Default: empty)
--	`SMTP_AUTH_METHOD` Authentication method for the SMTP Mail-Gateway (Default: empty/plain text)
+-	`SMTP` Address of the SMTP Mail-Gateway. (**required** - Default: `localhost`)
+-	`SMTP_FROM` Sender user-part of the address. (Default: `no-reply` - e.g. no-reply@friendica.local)
+-	`SMTP_AUTH_USER` Username for the SMTP Mail-Gateway. (Default: empty)
+-	`SMTP_AUTH_PASS` Password for the SMTP Mail-Gateway. (Default: empty)
+-	`SMTP_AUTH_METHOD` Authentication method for the SMTP Mail-Gateway. (Default: empty/plain text)
 
 **Database** (**required**)
 -	`MYSQL_USERNAME` Username for the database user using mysql.
@@ -91,6 +91,15 @@ This is the full list of all possible environment variables used for this image:
 -	`MYSQL_HOST` Hostname of the database server using mysql / mariadb.
 -	`MYSQL_PORT` Port of the database server using mysql / mariadb.
 
+**Caching**
+-	`CACHE_DRIVER` Driver of the Friendica cache (`memcache`, `memcached` or `redis`)
+-	`MEMCACHE_HOST` Host of the memcache cache server. (Default: `127.0.0.1`)
+-	`MEMCACHE_PORT` Port of the memcache cache server. (Default: `11211`)
+-	`MEMCACHED_HOSTS` Hosts of the memcached cache server. (Default: `[['127.0.0.1', 11211]]`)
+-	`REDIS_HOST` Host of the redis cache server. (Default: `127.0.0.1`)
+-	`REDIS_PORT` Port of the redis cache server. (Default: `6379`)
+
+
 ## Administrator account
 
 Because Friendica links the administrator account to a specific mail address, you **have** to set a valid address for `MAILNAME`.
diff --git a/update.sh b/update.sh
index aee65be..0886257 100755
--- a/update.sh
+++ b/update.sh
@@ -25,6 +25,8 @@ declare -A extras=(
 
 declare -A pecl_versions=(
 	[Imagick]='3.4.3'
+	[memcached]='3.0.4'
+	[redis]='3.1.6'
 )
 
 declare -A install_extras=(
@@ -73,6 +75,8 @@ function create_variant() {
 		s|%%VARIANT_EXTRAS%%|'"${extras[$variant]}"'|g;
 		s|%%INSTALL_EXTRAS%%|'"${install_extras[$install_type]}"'|g;
 		s/%%IMAGICK_VERSION%%/'"${pecl_versions[Imagick]}"'/g;
+		s/%%MEMCACHED_VERSION%%/'"${pecl_versions[memcached]}"'/g;
+		s/%%REDIS_VERSION%%/'"${pecl_versions[redis]}"'/g;
 	' "$dir/Dockerfile"
 
 	# Copy the shell scripts