MongoDB Replica Set高可用性的建置

  1. 建立三個MongoDB
echo "[info] 建立測試環境";
docker network create mongo-cluster >/dev/null 2>&1
docker rm -f mongo1 mongo2 mongo3 >/dev/null 2>&1
for i in 1 2 3
do
  echo "       mongo${i} 建立"
  docker run \
    -d \
    -p 3000$i:27017 \
    --name mongo$i \
    --net mongo-cluster \
    mongo mongod --replSet my-mongo-set >/dev/null 2>&1
done
  1. 接著設定三者關係,並強制設定electionTimeoutMillis為500ms.
echo "       設定mongo cluster"
docker exec -it mongo3 mongo --eval "config={\"_id\":\"my-mongo-set\",\"members\":[{\"_id\":0,\"host\":\"mongo1:27017\"},{\"_id\":1,\"host\":\"mongo2:27017\"},{\"_id\":2,\"host\":\"mongo3:27017\"}],\"settings\": { \"electionTimeoutMillis\": 500 }}; rs.initiate(config)"
  1. PHP測試
#https://github.com/mongodb/mongo-php-library
require_once __DIR__ . "/vendor/autoload.php";

try{
  $client = new MongoDB\Client("mongodb://mongo1:27017,mongo2:27017,mongo3:27017",[],[
    'typeMap' => [
      'array' => 'array',
      'document' => 'array',
      'root' => 'array',
    ],
  ]);
  $db = $client->selectDatabase('test');
  $cursor = $db->command(['isMaster' => 1]);
  echo "[info] 成功連線至: {$cursor->toArray()[0]['primary']}\n";

} catch(Exception $e) {
  echo "[error] 無法線連\n";
  exit;
}

{  //若Collection:testA不存在則建立.
  if((iterator_count($db->listCollections([
    'filter'=>[
      'name'=>'testA'
    ]
  ])))==0) //當數量為0時,建立testA
    $db->createCollection('testA');
}

//連線至Collection:testA
$collection=$db->selectCollection('testA');

//若沒有任何資料,則建立100則隨機資料
if($collection->count()==0){
  for($i=0;$i<100;$i++){
    $insertOneResult = $collection->insertOne([
      'idx' => $i,
      'value' => "{$i}, rand: ".rand(0,9999),
    ]);
  }
}

//取得最後三筆資料
foreach($collection->find([],[
  'limit' => 3,
  'projection' => ['_id'=>0],
  'sort' => [
    'idx'=>-1
  ]
]) as $rs){
  echo "\tidx:{$rs['idx']}\tvalue:{$rs['value']}\n";
}

php.ini 常見設定

php.ini檔案位置/etc/php5/apache2/php.ini
php-fpm檔案位置/etc/php5/fpm/php.ini
而php cli位置應該是在 /etc/php5/cli/php.ini

sudo vim /etc/php5/apache2/php.ini
# or
sudo vim /etc/php5/fpm/php.ini
# or
sudo vim /etc/php5/cli/php.ini

可以用下列指令確認

php -i |grep php\.ini

我個人常用的設定為(for debug):

short_open_tag=On
memory_limit=2000M
error_reporting=E_ALL & ~E_DEPRECATED & ~E_NOTICE & ~E_STRICT
display_error=On
post_max_size=20000M
upload_max_filesize=20000M
max_file_uploads=200

其中,memory_limit > post_max_size > upload_max_filesize

修改之後,得要重新啟動apache2

sudo /etc/init.d/apache2 restart
# or
sudo service apache2 restart

vim 快速修改方式:

#for apache2
sudo vim /etc/php5/apache2/php.ini
:1,$s/short_open_tag\ =\ Off/short_open_tag\ =\ On/g
:1,$s/memory_limit\ =\ 128M/memory_limit\ =\ 2000M/g
:1,$s/display_errors\ =\ Off/display_errors\ =\ On/g
:1,$s/post_max_size\ =\ 8M/post_max_size\ =\ 2000M/g
:1,$s/upload_max_filesize\ =\ 2M/upload_max_filesize\ =\ 2000M/g
:1,$s/max_file_uploads\ =\ 20/max_file_uploads\ =\ 200/g
/error_reporting
/
:1,$s/error_reporting\ =\ E_ALL\ &\ \~E_DEPRECATED\ &\ \~E_STRICT//g
aerror_reporting = E_ALL & ~E_DEPRECATED & ~E_NOTICE & ~E_STRICT
#for cli
sudo vim /etc/php5/cli/php.ini
:1,$s/short_open_tag\ =\ Off/short_open_tag\ =\ On/g
:1,$s/memory_limit\ =\ 128M/memory_limit\ =\ 2000M/g
:1,$s/display_errors\ =\ Off/display_errors\ =\ On/g
:1,$s/post_max_size\ =\ 8M/post_max_size\ =\ 2000M/g
:1,$s/upload_max_filesize\ =\ 2M/upload_max_filesize\ =\ 2000M/g
:1,$s/max_file_uploads\ =\ 20/max_file_uploads\ =\ 200/g
/error_reporting
/
:1,$s/error_reporting\ =\ E_ALL\ &\ \~E_DEPRECATED\ &\ \~E_STRICT//g
aerror_reporting = E_ALL & ~E_DEPRECATED & ~E_NOTICE & ~E_STRICT