[Solr] Refuse to start with RAM lt 2 GB

[Config/Update] Set limits and change descriptions for Solr

data/Dockerfiles/solr/docker-entrypoint.sh

@@ -6,6 +6,16 @@ if [[ "${SKIP_SOLR}" =~ ^([yY][eE][sS]|[yY])+$ ]]; then
   exit 0
 fi
 
+MEM_TOTAL=$(awk '/MemTotal/ {print $2}' /proc/meminfo)
+
+if [[ "${1}" != "--bootstrap" ]]; then
+  if [ ${MEM_TOTAL} -lt "2097152" ]; then
+    echo "System memory less than 2 GB, skipping Solr..."
+    sleep 365d
+    exit 0
+  fi
+fi
+
 set -e
 
 # allow easier debugging with `docker run -e VERBOSE=yes`
@@ -158,7 +168,11 @@ function solr_config() {
 
 # fixing volume permission
 [[ -d /opt/solr/server/solr/dovecot/data ]] && chown -R solr:solr /opt/solr/server/solr/dovecot/data
-sed -i 's/#SOLR_HEAP="512m"/SOLR_HEAP="'${SOLR_HEAP:-1024}'m"/g' /opt/solr/bin/solr.in.sh
+if [[ "${1}" != "--bootstrap" ]]; then
+  sed -i '/SOLR_HEAP=/c\SOLR_HEAP="'${SOLR_HEAP:-1024}'m"' /opt/solr/bin/solr.in.sh
+else
+  sed -i '/SOLR_HEAP=/c\SOLR_HEAP="256m"' /opt/solr/bin/solr.in.sh
+fi
 
 # start a Solr so we can use the Schema API, but only on localhost,
 # so that clients don't see Solr until we have configured it.

generate_config.sh

@@ -50,9 +50,10 @@ done
 
 MEM_TOTAL=$(awk '/MemTotal/ {print $2}' /proc/meminfo)
 
-if [ ${MEM_TOTAL} -le "1572864" ]; then
-  echo "Installed memory is less than 1.5 GiB. It is recommended to disable ClamAV to prevent out-of-memory situations."
-  read -r -p  "Do you want to disable ClamAV now? ClamAV can be re-enabled by setting SKIP_CLAMD=n in mailcow.conf. [Y/n] " response
+if [ ${MEM_TOTAL} -le "2621440" ]; then
+  echo "Installed memory is <= 2.5 GiB. It is recommended to disable ClamAV to prevent out-of-memory situations."
+  echo "ClamAV can be re-enabled by setting SKIP_CLAMD=n in mailcow.conf."
+  read -r -p  "Do you want to disable ClamAV now? [Y/n] " response
   case $response in
     [nN][oO]|[nN])
       SKIP_CLAMD=n
@@ -65,10 +66,14 @@ else
   SKIP_CLAMD=n
 fi
 
-if [ ${MEM_TOTAL} -le "3670016" ]; then
-  echo "Installed memory is less than 3.5 GiB. It is highly recommended to disable Solr to prevent out-of-memory situations."
-  echo "Solr is a prone to run OOM and should be monitored. The default Solr heap size is 1024 MiB and should be set according to your expected load in mailcow.conf."
-  read -r -p  "Do you want to disable Solr now (recommended)? Solr can be re-enabled by setting SKIP_SOLR=n in mailcow.conf. [Y/n] " response
+if [ ${MEM_TOTAL} -le "2097152" ]; then
+  echo "Disabling Solr on low-memory system."
+  SKIP_SOLR=y
+elif [ ${MEM_TOTAL} -le "3670016" ]; then
+  echo "Installed memory is <= 3.5 GiB. It is recommended to disable Solr to prevent out-of-memory situations."
+  echo "Solr is a prone to run OOM and should be monitored. The default Solr heap size is 1024 MiB and should be set in mailcow.conf according to your expected load."
+  echo "Solr can be re-enabled by setting SKIP_SOLR=n in mailcow.conf but will refuse to start with less than 2 GB total memory."
+  read -r -p  "Do you want to disable Solr now? [Y/n] " response
   case $response in
     [nN][oO]|[nN])
       SKIP_SOLR=n

update.sh

@@ -219,6 +219,7 @@ for option in ${CONFIG_ARRAY[@]}; do
       echo "Adding new option \"${option}\" to mailcow.conf"
       echo '# Solr heap size, there is no recommendation, please see Solr docs.' >> mailcow.conf
       echo '# Solr is a prone to run OOM on large systems and should be monitored. Unmonitored Solr setups are not recommended.' >> mailcow.conf
+      echo '# Solr will refuse to start with total system memory below or equal to 2 GB.' >> mailcow.conf
       echo "SOLR_HEAP=1024" >> mailcow.conf
   fi
   elif ! grep -q ${option} mailcow.conf; then