installMongo.sh

#!/usr/bin/env bash
#
# Compile and install MongoDB with SSL support
# tested an works on Ubuntu 12.04 LTS x64 and Ubuntu 14.04 LTS x64
#


set -e
set -u
set -o pipefail
# set -x     #debugging


#
# CONFIGURATION SECTION
#
export MONGO_VERSION="r2.4.12"      # Which version of MongoDB, which corresponds to a git tag
                                    # You can list available versions  with `git tag | grep -v "rc"`
                                    # inside the mongo git respository

# Self-signed SSL Certificate settings
export SSL_HOSTNAME="${HOSTNAME}"   # Should be FQDN of your MongoDB server
export SSL_C="US"                   # Country
export SSL_ST="California"          # State
export SSL_O="Radiant"              # Organization
export SSL_DAYS="3650"              # Valid for in days == 10 years


#
#  SANITY CHECKS
#

# See http://blog.mongodb.org/post/137788967/32-bit-limitations
if [ "${HOSTTYPE}" != "x86_64" ]; then
  echo "MongoDB should be installed on a 64-bit OS" >&2
  exit 1
fi


# A non-scientific test compiling MongoDB showed it used around 11 GB storage at its peak
cd /usr/src
export FREE_SPACE=$(($(stat -f --format="%a*%S" .)))
export FREE_SPACE_NEEDED=14000000000 # ~14 GB

if [ "${FREE_SPACE}" -le "${FREE_SPACE_NEEDED}" ]; then
  echo "Not enough free space in /usr/src" >&2
  exit 1
fi


# Compilation will fail without 2+ GB of RAM and/or SWAP
export TOTAL_RAM=`free -mt | grep Total | awk '{print $2}'`

if [ ${MONGO_VERSION} = "r2.4.12" ]; then
  export RAM_NEEDED=3000
else
  export RAM_NEEDED=5000
fi

if [ ${TOTAL_RAM} -lt ${RAM_NEEDED} ]; then
  echo "Compiliation needs more than ${TOTAL_RAM} ram/swap space" >&2
  exit 1
fi


#
# PREREQUSITIES
#


# install all the prerequsite packages needed for compilation
export DEBIAN_FRONTEND=noninteractive
aptitude install build-essential scons git-core libssl-dev libboost-filesystem-dev \
                 libboost-program-options-dev libboost-system-dev libboost-thread-dev \
                 -q -y


# clone the source from github, and check out the proper release
git clone git://github.com/mongodb/mongo.git
cd /usr/src/mongo
git checkout "${MONGO_VERSION}"


#
# PATCHING
#

if [ "${MONGO_VERSION}" = "r2.4.12" ]; then

  # fix for BOOST bug https://svn.boost.org/trac/boost/ticket/7242
  patch SConstruct <<EOF
709a710,711
>                          "-Wno-unused-function",
>                          "-Wno-unused-local-typedefs",
EOF

  # MongoDB will compile and install properly but will error on the stacktrace test
  # if this patch isn't applied, which will cause this script to return a failed exit code.
  # snatched from http://git.alpinelinux.org/cgit/aports/plain/testing/mongodb/mongodb-2.4.4-fix-sharedclient.patch
  patch src/mongo/SConscript <<EOF
459c459
<             LIBDEPS=['stacktrace',
---
>             LIBDEPS=['stacktrace', 'foundation', 'mongocommon', 'alltools',
EOF

fi



#
# COMPILATION and INSTALLATION
#

# this takes ~40 min on a Digital Ocean 2 core/2GB RAM droplet
scons core install --64 --ssl -j4 --no-glibc-check --prefix=/usr

# run the post-install script which makes the mongo user, creates the data folder
# and sets various permissions
cd /usr/src/mongo/debian
chmod +x postinst
./postinst configure

# configure upstart and create base config file
cp mongodb.upstart /etc/init/mongodb.conf
cp mongodb.conf /etc

# create a logrotate script so our log files don't overflow
cat > /etc/logrotate.d/mongodb-server <<EOF
/var/log/mongodb/*.log {
  weekly
  rotate 10
  copytruncate
  delaycompress
  compress
  notifempty
  missingok
}
EOF


#
# CONFIGURE SSL
#

# generate a self-signed SSL key/cert
cd /etc/ssl

openssl req \
    -new \
    -newkey rsa:4096 \
    -x509 \
    -days ${SSL_DAYS} \
    -nodes \
    -subj "/C=${SSL_C}/ST=${SSL_ST}/O=${SSL_O}/CN=${SSL_HOSTNAME}" \
    -keyout mongodb.key \
    -out mongodb.crt

# configure mongo to use the key/cert
cat mongodb.key mongodb.crt > mongodb.pem

cat >> /etc/mongodb.conf <<EOF
sslOnNormalPorts = prefer
sslPEMKeyFile = /etc/ssl/mongodb.pem
EOF


#
# CLEANUP
#

cd ~
rm -rf /usr/src/mongo