Redis 主從服務器搭建

時間  2020-07-23
標籤 redis 主從 服務器 搭建 欄目 Redis 简体版
原文   原文鏈接

1. 利用 HomeBrew 安裝 Redis

$ brew install redis
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HomeBrew 安裝的軟件會默認在 /usr/local/Cellar 路徑下 Redis 的配置文件 redis.conf 存放在 /usr/local/etc 路徑下。redis

2. Redis 命令

redis-server：啓動 redis 服務器

啓動 redis 服務器能夠選擇帶配置文件啓動和不帶配置文件啓動。bash

不帶配置文件

啓動命令：服務器

redis-server
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輸出信息：測試

➜  ~ redis-server
46905:C 16 Jul 11:43:13.067 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
46905:C 16 Jul 11:43:13.068 # Redis version=4.0.11, bits=64, commit=00000000, modified=0, pid=46905, just started
46905:C 16 Jul 11:43:13.068 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf
46905:M 16 Jul 11:43:13.069 * Increased maximum number of open files to 10032 (it was originally set to 4864).
                _._
           _.-``__ ''-._
      _.-``    `.  `_.  ''-._           Redis 4.0.11 (00000000/0) 64 bit
  .-`` .-```.  ```\/    _.,_ ''-._
 (    ' , .-` | `, ) Running in standalone mode |`-._`-...-` __...-.``-._|'` _.-'| Port: 6379 | `-._ `._ / _.-'    |     PID: 46905
  `-._    `-._  `-./  _.-' _.-'
 |`-._`-._    `-.__.-' _.-'_.-'| | `-._`-._ _.-'_.-' | http://redis.io `-._ `-._`-.__.-'_.-' _.-'
 |`-._`-._    `-.__.-' _.-'_.-'| | `-._`-._ _.-'_.-' | `-._ `-._`-.__.-'_.-' _.-'
      `-._    `-.__.-' _.-'
          `-._        _.-' `-.__.-'

46905:M 16 Jul 11:43:13.071 # Server initialized
46905:M 16 Jul 11:43:13.071 * Ready to accept connections
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Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf 經過這句提示咱們能夠知道若是啓動服務器時沒有輸入配置文件路徑的話，選擇的是默認的配置文件路徑。ui

帶配置文件

啓動命令：spa

redis-server /usr/local/etc/redis.conf
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輸出信息：日誌

➜  ~ redis-server /usr/local/etc/redis.conf
46487:C 16 Jul 11:12:41.858 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
46487:C 16 Jul 11:12:41.859 # Redis version=4.0.11, bits=64, commit=00000000, modified=0, pid=46487, just started
46487:C 16 Jul 11:12:41.859 # Configuration loaded
46487:M 16 Jul 11:12:41.860 * Increased maximum number of open files to 10032 (it was originally set to 4864).
                _._
           _.-``__ ''-._
      _.-``    `.  `_.  ''-._           Redis 4.0.11 (00000000/0) 64 bit
  .-`` .-```.  ```\/    _.,_ ''-._
 (    ' , .-` | `, ) Running in standalone mode |`-._`-...-` __...-.``-._|'` _.-'| Port: 6379 | `-._ `._ / _.-'    |     PID: 46487
  `-._    `-._  `-./  _.-' _.-'
 |`-._`-._    `-.__.-' _.-'_.-'| | `-._`-._ _.-'_.-' | http://redis.io `-._ `-._`-.__.-'_.-' _.-'
 |`-._`-._    `-.__.-' _.-'_.-'| | `-._`-._ _.-'_.-' | `-._ `-._`-.__.-'_.-' _.-'
      `-._    `-.__.-' _.-'
          `-._        _.-' `-.__.-'

46487:M 16 Jul 11:12:41.949 # Server initialized
46487:M 16 Jul 11:12:41.950 * DB loaded from disk: 0.001 seconds
46487:M 16 Jul 11:12:41.950 * Ready to accept connections
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帶配置文件啓動 且指定某幾個配置 配置名稱前加 --

啓動命令：code

redis-server /usr/local/etc/redis.conf --port 6480
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輸出信息以下，能夠看到啓動端口就是咱們上述設置的端口：server

48859:C 16 Jul 14:00:13.142 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
48859:C 16 Jul 14:00:13.143 # Redis version=4.0.11, bits=64, commit=00000000, modified=0, pid=48859, just started
48859:C 16 Jul 14:00:13.143 # Configuration loaded
48859:M 16 Jul 14:00:13.144 * Increased maximum number of open files to 10032 (it was originally set to 4864).
                _._
           _.-``__ ''-._
      _.-``    `.  `_.  ''-._           Redis 4.0.11 (00000000/0) 64 bit
  .-`` .-```.  ```\/    _.,_ ''-._
 (    ' , .-` | `, ) Running in standalone mode |`-._`-...-` __...-.``-._|'` _.-'| Port: 6480 | `-._ `._ / _.-'    |     PID: 48859
  `-._    `-._  `-./  _.-' _.-'
 |`-._`-._    `-.__.-' _.-'_.-'| | `-._`-._ _.-'_.-' | http://redis.io `-._ `-._`-.__.-'_.-' _.-'
 |`-._`-._    `-.__.-' _.-'_.-'| | `-._`-._ _.-'_.-' | `-._ `-._`-.__.-'_.-' _.-'
      `-._    `-.__.-' _.-'
          `-._        _.-' `-.__.-'

48859:M 16 Jul 14:00:13.146 # Server initialized
48859:M 16 Jul 14:00:13.147 * DB loaded from disk: 0.001 seconds
48859:M 16 Jul 14:00:13.147 * Ready to accept connections
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redis-cli：啓動客戶端

客戶端默認鏈接的 IP 和 端口號是 127.0.0.1 和 6379ip

不帶 IP 和 PORT

啓動命令：

redis-cli
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執行結果以下：

➜  ~ redis-cli
Could not connect to Redis at 127.0.0.1:6379: Connection refused
Could not connect to Redis at 127.0.0.1:6379: Connection refused
not connected>
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緣由是咱們剛纔啓動的是 6480 端口，因此沒法鏈接。

注：若是咱們沒有啓動 redis 服務端，而後鏈接 redis 客戶端的話，錯誤和上述信息一致。

帶 IP 和 PORT

啓動命令：

redis-cli -h 127.0.0.1 -p 6480
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執行成功結果：

➜  ~ redis-cli -h 127.0.0.1 -p 6480
127.0.0.1:6480>
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3. 主從環境搭建

  1. 複製配置文件
cp /usr/local/etc/redis.conf /usr/local/etc/redis_slave.conf
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  1. 修改 redis_slave.conf 配置文件，須要修改的位置以下：
port 6380

slaveof 127.0.0.1 6379
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注意：slaveof 原始配置文件格式以下：slaveof <masterip> <masterport>，尖括號也須要去掉。

啓動主從服務器

啓動主服務器：

redis-server /usr/local/etc/redis.conf
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輸出信息以下：

49160:C 16 Jul 14:13:27.822 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
49160:C 16 Jul 14:13:27.822 # Redis version=4.0.11, bits=64, commit=00000000, modified=0, pid=49160, just started
49160:C 16 Jul 14:13:27.822 # Configuration loaded
49160:M 16 Jul 14:13:27.824 * Increased maximum number of open files to 10032 (it was originally set to 4864).
                _._
           _.-``__ ''-._
      _.-``    `.  `_.  ''-._           Redis 4.0.11 (00000000/0) 64 bit
  .-`` .-```.  ```\/    _.,_ ''-._
 (    ' , .-` | `, ) Running in standalone mode |`-._`-...-` __...-.``-._|'` _.-'| Port: 6379 | `-._ `._ / _.-'    |     PID: 49160
  `-._    `-._  `-./  _.-' _.-'
 |`-._`-._    `-.__.-' _.-'_.-'| | `-._`-._ _.-'_.-' | http://redis.io `-._ `-._`-.__.-'_.-' _.-'
 |`-._`-._    `-.__.-' _.-'_.-'| | `-._`-._ _.-'_.-' | `-._ `-._`-.__.-'_.-' _.-'
      `-._    `-.__.-' _.-'
          `-._        _.-' `-.__.-'

49160:M 16 Jul 14:13:27.828 # Server initialized
49160:M 16 Jul 14:13:27.828 * DB loaded from disk: 0.000 seconds
49160:M 16 Jul 14:13:27.828 * Ready to accept connections
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啓動從服務器

啓動命令：

redis-server /usr/local/etc/redis_slave.conf
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輸出信息以下：

49193:C 16 Jul 14:14:30.648 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
49193:C 16 Jul 14:14:30.649 # Redis version=4.0.11, bits=64, commit=00000000, modified=0, pid=49193, just started
49193:C 16 Jul 14:14:30.649 # Configuration loaded
49193:S 16 Jul 14:14:30.651 * Increased maximum number of open files to 10032 (it was originally set to 4864).
                _._
           _.-``__ ''-._
      _.-``    `.  `_.  ''-._           Redis 4.0.11 (00000000/0) 64 bit
  .-`` .-```.  ```\/    _.,_ ''-._
 (    ' , .-` | `, ) Running in standalone mode |`-._`-...-` __...-.``-._|'` _.-'| Port: 6380 | `-._ `._ / _.-'    |     PID: 49193
  `-._    `-._  `-./  _.-' _.-'
 |`-._`-._    `-.__.-' _.-'_.-'| | `-._`-._ _.-'_.-' | http://redis.io `-._ `-._`-.__.-'_.-' _.-'
 |`-._`-._    `-.__.-' _.-'_.-'| | `-._`-._ _.-'_.-' | `-._ `-._`-.__.-'_.-' _.-'
      `-._    `-.__.-' _.-'
          `-._        _.-' `-.__.-'

49193:S 16 Jul 14:14:30.653 # Server initialized
49193:S 16 Jul 14:14:30.653 * DB loaded from disk: 0.000 seconds
49193:S 16 Jul 14:14:30.653 * Ready to accept connections
49193:S 16 Jul 14:14:30.653 * Connecting to MASTER 127.0.0.1:6379
49193:S 16 Jul 14:14:30.653 * MASTER <-> SLAVE sync started
49193:S 16 Jul 14:14:30.654 * Non blocking connect for SYNC fired the event.
49193:S 16 Jul 14:14:30.654 * Master replied to PING, replication can continue...
49193:S 16 Jul 14:14:30.654 * Partial resynchronization not possible (no cached master)
49193:S 16 Jul 14:14:30.655 * Full resync from master: 99edd0e3826785242217fb243618d96ace866a42:0
49193:S 16 Jul 14:14:30.708 * MASTER <-> SLAVE sync: receiving 176 bytes from master
49193:S 16 Jul 14:14:30.708 * MASTER <-> SLAVE sync: Flushing old data
49193:S 16 Jul 14:14:30.709 * MASTER <-> SLAVE sync: Loading DB in memory
49193:S 16 Jul 14:14:30.709 * MASTER <-> SLAVE sync: Finished with success
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能夠看到其中有一條日誌，Connecting to MASTER 127.0.0.1:6379，說明從服務器鏈接上主服務器了。

咱們再看一下主服務器的日誌：

49160:M 16 Jul 14:13:27.828 # Server initialized
49160:M 16 Jul 14:13:27.828 * DB loaded from disk: 0.000 seconds
49160:M 16 Jul 14:13:27.828 * Ready to accept connections
49160:M 16 Jul 14:14:30.654 * Slave 127.0.0.1:6380 asks for synchronization
49160:M 16 Jul 14:14:30.654 * Full resync requested by slave 127.0.0.1:6380
49160:M 16 Jul 14:14:30.654 * Starting BGSAVE for SYNC with target: disk
49160:M 16 Jul 14:14:30.655 * Background saving started by pid 49194
49194:C 16 Jul 14:14:30.657 * DB saved on disk
49160:M 16 Jul 14:14:30.708 * Background saving terminated with success
49160:M 16 Jul 14:14:30.708 * Synchronization with slave 127.0.0.1:6380 succeeded
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咱們看到 Synchronization with slave 127.0.0.1:6380 succeeded 這條日誌，主從服務器創建成功了。

啓動客戶端

啓動客戶端的時候，咱們須要指定端口

啓動命令以下：

redis-cli -p 6379
127.0.0.1:6379>

redis-cli -p 6380
127.0.0.1:6380>
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主從測試

咱們在主服務器上插入一條測試數據

127.0.0.1:6379> set test1 test1
OK
127.0.0.1:6379>
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咱們再從從服務器上嘗試讀取測試數據

127.0.0.1:6380> get test1
"test1"
127.0.0.1:6380>
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發現可以正常讀取獲得，說明主從服務器搭建是成功的。

反過來，咱們再測試一下。

在從服務器上插入一條測試數據：

127.0.0.1:6380> set test2 test2
(error) READONLY You can't write against a read only slave. 127.0.0.1:6380> 複製代碼

說明從服務器上是隻讀的，不能寫入數據。

固然咱們也能夠設置從服務器能夠寫數據，可是在從服務器上寫的這部分數據是不能同步給主服務器的，因此不建議開啓。

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