add mongodb role

ansible/roles/mongodb/files/disable-thp.service

@@ -0,0 +1,9 @@
+[Unit]
+Description=Disable Transparent Huge Pages (THP)
+DefaultDependencies=no
+After=sysinit.target local-fs.target
+[Service]
+Type=oneshot
+ExecStart=/bin/sh -c 'echo never | tee /sys/kernel/mm/transparent_hugepage/enabled > /dev/null'
+[Install]
+WantedBy=basic.target

ansible/roles/mongodb/files/local.conf

@@ -0,0 +1,2 @@
+vm.swappiness=1
+vm.max_map_count=128000

ansible/roles/mongodb/files/logrotate.conf

@@ -0,0 +1,13 @@
+/var/log/mongodb/mongod.log {
+  daily
+  rotate 7
+  missingok
+  compress
+  delaycompress
+  notifempty
+  create 640 mongodb mongodb
+  sharedscripts
+  postrotate
+    /bin/kill -SIGUSR1 `cat /var/run/mongodb/mongod.pid 2>/dev/null` >/dev/null 2>&1
+  endscript
+}