Don't wig out when on a 1GB instance with swap

[discourse_docker.git] / launcher

diff --git a/launcher b/launcher
index 63209bbbb9cf61eb4320ab4df49227003945befc..e1a758d656b77ef1a1174e99a209fdc80fc5e017 100755 (executable)
--- a/launcher
+++ b/launcher
@@ -151,6 +151,51 @@ prereqs() {
     echo "See: https://meta.discourse.org/t/docker-error-on-bootstrap/13657/18?u=sam"
     exit 1
   fi
+
+  # 6. sufficient available resources
+  # 6a. Memory
+  #
+  resources="ok"
+  avail_mem="$(LANG=C free -m | grep '^Mem:' | awk '{print $2}')"
+  if [ "$avail_mem" -lt 900 ]; then
+    resources="insufficient"
+    echo "WARNING: You do not appear to have sufficient memory to run Discourse."
+    echo
+    echo "Your system may not work properly, or future upgrades of Discourse may"
+    echo "not complete successfully."
+    echo
+    echo "See https://github.com/discourse/discourse/blob/master/docs/INSTALL-cloud.md#create-new-cloud-server"
+  elif [ "$avail_mem" -lt 1800 ]; then
+    total_swap="$(LANG=C free -m | grep ^Swap: | awk '{print $2}')"
+    if [ "$total_swap" -lt 1000 ]; then
+      resources="insufficient"
+      echo "WARNING: You must have at least 1GB of swap when running with less"
+      echo "than 2GB of RAM."
+      echo
+      echo "Your system may not work properly, or future upgrades of Discourse may"
+      echo "not complete successfully."
+      echo
+      echo "See https://github.com/discourse/discourse/blob/master/docs/INSTALL-cloud.md#set-up-swap-if-needed"
+    fi
+  fi
+
+  # 6b. Disk space
+  free_disk="$(df /var | tail -n 1 | awk '{print $4}')"
+  if [ "$free_disk" -lt 5000 ]; then
+    resources="insufficient"
+    echo "WARNING: You must have at least 5GB of *free* disk space to run Discourse."
+    echo
+    echo "Insufficient disk space may result in problems running your site, and may"
+    echo "not even allow Discourse installation to complete successfully."
+    echo
+    echo "Please free up some space, or expand your disk, before continuing."
+    exit 1
+  fi
+
+  if [ -t 0 ] && [ "$resources" != "ok" ]; then
+    echo
+    read -p "Press ENTER to continue, or Ctrl-C to exit and give your system more resources"
+  fi
 }
 
 if [ "$opt" != "--skip-prereqs" ] ; then
@@ -187,18 +232,16 @@ get_ssh_pub_key() {
 
 install_docker() {
 
-  echo "Docker is not installed, make sure you are running on the 3.8 kernel"
-  echo "The best supported Docker release is Ubuntu 12.04.03 for it run the following"
+  echo "Docker is not installed, you will need to install Docker in order to run Discourse"
+  echo "Please visit https://docs.docker.com/installation/ for instructions on how to do this for your system"
   echo
-  echo "sudo apt-get update"
-  echo "sudo apt-get install linux-image-generic-lts-raring linux-headers-generic-lts-raring"
-  echo "sudo reboot"
+  echo "If you are running Ubuntu Trusty or later, you can try the following:"
   echo
 
-  echo "sudo sh -c \"wget -qO- https://get.docker.io/gpg | apt-key add -\""
-  echo "sudo sh -c \"echo deb http://get.docker.io/ubuntu docker main > /etc/apt/sources.list.d/docker.list\""
+  echo "sudo apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D"
+  echo "sudo sh -c \"echo deb https://apt.dockerproject.org/repo ubuntu-$(lsb_release -sc) main > /etc/apt/sources.list.d/docker.list\""
   echo "sudo apt-get update"
-  echo "sudo apt-get install lxc-docker"
+  echo "sudo apt-get install docker-engine"
 
   exit 1
 }
@@ -401,6 +444,9 @@ run_start(){
    ports=`cat $config_file | $docker_path run $user_args --rm -i -a stdout -a stdin $image ruby -e \
           "require 'yaml'; puts YAML.load(STDIN.readlines.join)['expose'].map{|p| '-p ' << p.to_s << ' '}.join"`
 
+   docker_args=`cat $config_file | $docker_path run $user_args --rm -i -a stdout -a stdin $image ruby -e \
+          "require 'yaml'; puts YAML.load(STDIN.readlines.join)['docker_args']"`
+
    set_template_info
    set_volumes
    set_links
@@ -409,7 +455,8 @@ run_start(){
      hostname=`hostname`
      set -x
      $docker_path run $user_args $links $attach_on_run $restart_policy "${env[@]}" -h "$hostname-$config" \
-        -e DOCKER_HOST_IP=$docker_ip --name $config -t $ports $volumes $local_discourse/$config /sbin/boot
+        -e DOCKER_HOST_IP=$docker_ip --name $config -t $ports $volumes $docker_args $local_discourse/$config \
+        /sbin/boot
 
    )
    exit 0