MongoDBシャードクラスターを構成し、シャードを管理する方法
序文
以前のブログの
リンクを見ることができます：https : //blog.csdn.net/m0_47219942/article/details/108552702。
リンク：https : //blog.csdn.net/m0_47219942/article/details/108552982。
練習
レプリケーションクラスターの構成
tar zxvf mongodb-linux-x86_64-3.2.1.tgz -C /opt/
cd /opt
[root@localhost opt]# ls
mongodb-linux-x86_64-3.2.1 rh
[root@localhost opt]# mv mongodb-linux-x86_64-3.2.1/ /usr/local/mongodb
[root@localhost opt]# cd /usr/local/
[root@localhost local]# ls
bin etc games include lib lib64 libexec mongodb sbin share src
[root@localhost local]# cd mongodb/
[root@localhost mongodb]# ls
bin GNU-AGPL-3.0 MPL-2 README THIRD-PARTY-NOTICES
[root@localhost mongodb]# cd bin/
[root@localhost bin]# ls
bsondump mongod mongoexport mongoimport mongoperf mongos mongotop
mongo mongodump mongofiles mongooplog mongorestore mongostat
[root@localhost bin]# ln -s /usr/local/mongodb/bin/mongo /usr/bin/mongo '做路径优化'
[root@localhost bin]# ln -s /usr/local/mongodb/bin/mongo /usr/bin/mongod
[root@localhost bin]# mkdir -p /data/mongodb/mongodb{
1,2,3,4}
[root@localhost bin]# cd /data/mongodb/
[root@localhost mongodb]# ls
mongodb1 mongodb2 mongodb3 mongodb4
[root@localhost mongodb]# mkdir logs
[root@localhost mongodb]# cd logs/
[root@localhost logs]# touch mongodb{
1,2,3,4}.log
[root@localhost logs]# chmod 777 *.log
[root@localhost logs]# ls
mongodb1.log mongodb2.log mongodb3.log mongodb4.log
'进程和打开文件数量进行放大，优化一下，避免缓存卡死'
[root@localhost logs]# ulimit -u 25000
[root@localhost logs]# ulimit -n 25000
[root@localhost logs]# cd /usr/local/mongodb/bin/
サーバーを構成する
[root@localhost bin]# vim mongodb1.conf
port=37017
dbpath=/data/mongodb/mongodb1
logpath=/data/mongodb/logs/mongodb1.log
logappend=true
fork=true
maxConns=5000
storageEngine=mmapv1
configsvr=true
ノードに十分なメモリがない場合、他のノードからメモリを割り当てます
sysctl -w vm.zone_reclaim_mode=0
echo never > /sys/kernel/mm/transparent_hugepage/enabled
echo never > /sys/kernel/mm/transparent_hugepage/defrag
[root@localhost bin]# ln -s /usr/local/mongodb/bin/mongo /usr/bin/mongo 做路径优化
[root@localhost bin]# ln -s /usr/local/mongodb/bin/mongo /usr/bin/mongod
[root@localhost bin]# mongod -f mongodb1.conf
about to fork child process, waiting until server is ready for connections.
forked process: 13225
child process started successfully, parent exiting
ノードサーバーの構成
[root@localhost bin]# cp -p mongodb1.conf mongodb2.conf
[root@localhost bin]# vim mongodb2.conf
port=47017 '修改端口'
dbpath=/data/mongodb/mongodb2 ‘修改’
logpath=/data/mongodb/logs/mongodb2.log ‘修改’
logappend=true
fork=true
maxConns=5000
storageEngine=mmapv1
shardsvr=true ‘修改为分片服务器’
[root@localhost bin]# cp -p mongodb2.conf mongodb3.conf
[root@localhost bin]# vim mongodb3.conf
port=47018
dbpath=/data/mongodb/mongodb3
logpath=/data/mongodb/logs/mongodb3.log
shardsvr=true
[root@localhost bin]# mongod -f mongodb2.conf
about to fork child process, waiting until server is ready for connections.
forked process: 13354
child process started successfully, parent exiting
[root@localhost bin]# mongod -f mongodb3.conf
about to fork child process, waiting until server is ready for connections.
forked process: 13373
child process started successfully, parent exiting
[root@localhost bin]# ./mongos --port 27017 --fork --logpath=/usr/local/mongodb/bin/route.log --configdb 20.0.0.51:37017 --chunkSize 1
mongo
mongos> show dbs
mongos> sh.status() 'shards下为空，没有分片服务器'
mongos> sh.addShard("20.0.0.51:47017") '添加分片服务器'
mongos> sh.addShard("20.0.0.51:47018")
mongos> sh.status()
shards:
{
" id" : "shard0000"，"host" : "20.0.0.51:47017" }
{
"id" : "shard0001"，"host" : "20.0.0.51:47018" }
シャーディング機能
./mongoimport -d kevin -c users --file /opt/testdb.txt
mongos> use kevin
mongos> for(var i=1;i<=10000;i++)db.users.insert({
"id":i,"name":"jack"+i})
mongos> show dbs
config 0.031GB
kevin 0.078GB
mongos> use kevin
mongos> show collections
system.indexes
users
mongos> db.users.find().limit(5)
mongos> sh.status() '查看数据库分片信息'
databases:
{
"id":"kevin"，"primary" : "shard0000",
"partitioned" : false }
mongos>sh. enableSharding("kevin") '启用数据库分片'
mongos> sh.status()
databases:
{
"id" : "kevin"，" primary" : "shard0000",
partitioned": true }
mongos>db.users.createIndex( {
"id":1}) '对users表创建索引'
mongos> sh.shardCollection("kevin.users",{
"id":1}) '表分片'
mongos> sh.status()
シャード管理
mongos> show dbs
admin 0.000GB
config 0.000GB
local 0.000GB
mongos> use kevin
switched to db kevin
mongos> for(var i=1;i<=50000;i++)db.users2.insert({
"id":i,"name":"tom"+1})
WriteResult({
"nInserted" : 1 })
mongos> db.users2.count()
50000
mongos> db.users2.find().limit(10) '查看前10行'
mongos> db.users2.createIndex({
"id":1}) '创建索引'
{
"createdCollectionAutomatically" : false,
"numIndexesBefore" : 1,
"numIndexesAfter" : 2,
"ok" : 1
}
mongos> sh.shardCollection("kevin.users2",{
"id":1})
mongos> db.users.stats()
タグ付けする
mongos> sh.addShardTag("shard0000","sales00")
mongos> sh.addShardTag("shard0001","sales01")
構成サーバーに接続する
mongo --port 37017
configsvr> use config
configsvr> show collections/show tables
...
collections
chunks
databases
...
configsvr> db.chunks.findOne() 查看分片
configsvr> db.collections.find()
configsvr>db.databases.find()
'当添加新的分片，原有数据量会怎么样？'
[root@localhost bin]# cp -p mongodb2.conf mongodb4.conf
[root@localhost bin]# vim mongodb4.conf
port=47018 修改
dbpath=/data/mongodb/mongodb4 修改
logpath=/data/mongodb/logs/mongodb4.log 修改
[root@localhost bin]# mongod -f mongodb4.conf
[root@localhost bin]# mongo
mongos> sh.addShard("20.0.0.51:47019")
mongos> sh.status()
chunks:
shard0000 4
shard0001 4
shard0002 3
'当你再添加一个新的分片，会自动的将原有数据量均匀分片'
シャードノードを削除
mongos> use admin
mongos> db.runCommand({
"removeshard":"20.0.0.51:47019"})
'当删除后，又会自动的平均分配'