redis慢查詢日誌
和mysql一樣redis也有慢查詢日誌,redis的慢查詢日誌默認是開啓的。
針對慢查詢日誌,主要是設置兩個參數,一個是執行時長,單位是微秒,另一個是慢查詢日誌的長度。當一個新的命令被寫入日誌時,最老的一條會從命令日誌隊列中被移除。
編輯配置文件,文件中搜素slowlog,可以設置以下幾個參數,一般情況下保持默認即可:
[root@aminglinux-149 ~]# vim /etc/redis.conf slowlog-log-slower-than 1000 //單位ms,表示慢於1000ms則記錄日誌 slowlog-max-len 128 //定義日誌長度,表示最多存128條
修改完後要重啓redis服務:
[root@aminglinux-149 ~]# killall redis-server [root@aminglinux-149 ~]# redis-server /etc/redis.conf
然後在redis的命令行中可以使用以下命令查看相應的慢查詢日誌信息
slowlog get //列出所有的慢查詢日誌 slowlog get 2 //只列出2條 slowlog len //查看慢查詢日誌條數 127.0.0.1:6379> slowlog get (empty list or set) 127.0.0.1:6379> slowlog get2 (error) ERR Unknown SLOWLOG subcommand or wrong # of args. Try GET, RESET, LEN. 127.0.0.1:6379> slowlog len (integer) 0
php安裝redis擴展
下載、解壓、編譯安裝,素質三連:
[root@localhost ~] # cd /usr/local/src/ [root@localhost /usr/local/src] # wget https://coding.net/u/aminglinux/p/yuanke_centos7/git/raw/master/21NOSQL/phpredis.zip [root@localhost /usr/local/src] # unzip phpredis.zip [root@localhost /usr/local/src] # cd phpredis-develop [root@localhost /usr/local/src/phpredis-develop] # /usr/local/php-fpm/bin/phpize Configuring for : PHP Api Version: 20131106 Zend Module Api No: 20131226 Zend Extension Api No: 220131226 [root@localhost /usr/local/src/phpredis-develop] # ./configure --with-php-config=/usr/local/php-fpm/bin/php-config [root@localhost /usr/local/src/phpredis-develop] # echo $? 0 [root@localhost /usr/local/src/phpredis-develop] # make && make install
編輯php配置文件:
[root@aminglinux-149 ~]# vim /usr/local/php-fpm/etc/php.ini vim /usr/local/php-fpm/etc/php.ini # 增加這一行 extension=redis.so
查看是否有redis模塊:
[root@aminglinux-149 ~]# /usr/local/php-fpm/bin/php -m|grep redis PHP Warning: PHP Startup: Unable to load dynamic library '/usr/local/php-fpm/lib/php/extensions/no-debug-non-zts-20131226/memcache.so' - /usr/local/php-fpm/lib/php/extensions/no-debug-non-zts-20131226/memcache.so: cannot open shared object file: No such file or directory in Unknown on line 0 redis
重啓php-fpm服務:
[root@aminglinux-149 ~]# /etc/init.d/php-fpm restart Gracefully shutting down php-fpm . done Starting php-fpm [17-Nov-2018 11:23:43] NOTICE: PHP message: PHP Warning: PHP Startup: Unable to load dynamic library '/usr/local/php-fpm/lib/php/extensions/no-debug-non-zts-20131226/memcache.so' - /usr/local/php-fpm/lib/php/extensions/no-debug-non-zts-20131226/memcache.so: cannot open shared object file: No such file or directory in Unknown on line 0 done
在PHP中使用redis存儲session
編輯PHP配置文件:
[root@aminglinux-149 ~]# vim /usr/local/php-fpm/etc/php.ini