Add compression and eviction policy to in-memory cache. (#783)

* Add compression and eviction policy to in-memory cache.

* Update Dockerfile

* Change log level to error to reduce noise

Dockerfile

@@ -60,12 +60,24 @@ RUN rm zz-docker.conf && \
 ## Set our pool configuration
 COPY deploy/config/php-pool.conf pool.conf
 
-# Apend our relay config to the existing config file.
-RUN { \
-        echo 'relay.maxmemory = 16M'; \
-        echo 'relay.loglevel = error'; \
-        echo 'relay.logfile  = /dev/stderr'; \
-    } >> /usr/local/etc/php/conf.d/docker-php-ext-relay.ini
+# Configure Relay - See https://relay.so/docs/1.x/configuration
+RUN RELAY_CONFIG_FILE=/usr/local/etc/php/conf.d/docker-php-ext-relay.ini && \
+    # Set log level to error
+    sed -i 's/^;\? \?relay.loglevel =.*/relay.loglevel = error/' $RELAY_CONFIG_FILE && \
+    # Set log file to stderr
+    sed -i 's/^;\? \?relay.logfile =.*/relay.logfile = \/dev\/stderr/' $RELAY_CONFIG_FILE && \
+    # Settings related to the in-memory cache (not Redis).
+    ## Set maxmemory to 16M - this is the max. w/o a license.
+    sed -i 's/^;\? \?relay.maxmemory =.*/relay.maxmemory = 16M/' $RELAY_CONFIG_FILE && \
+    ## Eviction policy: lru. Evicts the least recently used keys out of all keys when relay.maxmemory_pct is reached
+    sed -i 's/^;\? \?relay.eviction_policy =.*/relay.eviction_policy = lru/' $RELAY_CONFIG_FILE && \
+    ## Start evicting keys when 90% of the memory is used.
+    sed -i 's/^;\? \?relay.maxmemory_pct =.*/relay.maxmemory_pct = 90/' $RELAY_CONFIG_FILE && \
+    ## Set the session compression to lz4
+    sed -i 's/^;\? \?relay.session.compression =.*/relay.session.compression = lz4/' $RELAY_CONFIG_FILE && \
+    ## Set the session compression level to 1
+    sed -i 's/^;\? \?relay.session.compression_level =.*/relay.session.compression_level = 1/' $RELAY_CONFIG_FILE
+
 
 # Don't log every request.
 RUN perl -pi -e 's#^(?=access\.log\b)#;#' /usr/local/etc/php-fpm.d/docker.conf

deploy/development/config.yml

@@ -12,3 +12,4 @@ data:
   # The following IDs are not private, they form part of the publicly visible oauth login url.
   OAUTH_CLIENT_ID: "51266573-d4eb-41db-8ebe-a9548aa4f01e"
   OAUTH_TENANT_ID: "0bb413d7-160d-4839-868a-f3d46537f6af"
+  WP_REDIS_USE_RELAY: 'true'

deploy/staging/config.yml

@@ -12,3 +12,4 @@ data:
   # The following IDs are not private, they form part of the publicly visible oauth login url.
   OAUTH_CLIENT_ID: "ffb808d2-312b-4ffe-a6e5-d6eacfd9f06f"
   OAUTH_TENANT_ID: "c6874728-71e6-41fe-a9e1-2e8c36776ad8"
+  WP_REDIS_USE_RELAY: 'true'