redis cluster 集群 安装 配置 详解
redis cluster 集群 安装 配置 详解
Redis 集群是一个提供在多个Redis间节点间共享数据的程序集.redis3.0以前,只支持主从同步的,如果主的挂了,写入就成问题了。3.0出来后就可以很好帮我们解决这个问题。
目前redis 3.0还不稳定,如果要用在生产环境中,要慎重。
一,redis服务器说明
- 192.168.10.219 6379
- 192.168.10.219 6380
- 192.168.10.219 6381
- 192.168.10.220 6382
- 192.168.10.220 6383
- 192.168.10.220 6384
192.168.10.219 6379
192.168.10.219 6380
192.168.10.219 6381 192.168.10.220 6382
192.168.10.220 6383
192.168.10.220 6384
要让集群正常运作至少需要三个主节点,不过在刚开始试用集群功能时, 强烈建议使用六个节点: 其中三个为主节点, 而其余三个则是各个主节点的从节点。所有用二台机器,开6个redis进程,模拟6台机器。
二,安装ruby,rubygems
- # yum -y install gcc openssl-devel libyaml-devel libffi-devel readline-devel zlib-devel gdbm-devel ncurses-devel gcc-c++ automake autoconf
- # yum -y install ruby rubygems //安装ruby rubygems
- //换源
- # gem source -l
- # gem source --remove http://rubygems.org/
- # gem sources -a http://ruby.taobao.org/
- # gem source -l
- # gem install redis --version 3.0.0 //安装gem_redis
- Successfully installed redis-3.0.0
- 1 gem installed
- Installing ri documentation for redis-3.0.0...
- Installing RDoc documentation for redis-3.0.0...
# yum -y install gcc openssl-devel libyaml-devel libffi-devel readline-devel zlib-devel gdbm-devel ncurses-devel gcc-c++ automake autoconf # yum -y install ruby rubygems //安装ruby rubygems //换源
# gem source -l
# gem source --remove http://rubygems.org/
# gem sources -a http://ruby.taobao.org/
# gem source -l # gem install redis --version 3.0.0 //安装gem_redis
Successfully installed redis-3.0.0
1 gem installed
Installing ri documentation for redis-3.0.0...
Installing RDoc documentation for redis-3.0.0...
以前写过一篇ruby on rails的文章,请参考:centos ruby on rails apache mysql 安装配置详解
喜欢手动编译的人,可以参考这篇文章,安装ruby.
三,安装redis3.0.0
1,安装redis
- # wget http://download.redis.io/releases/redis-3.0.0.tar.gz
- # tar -xvzf redis-3.0.0.tar.gz
- # cd redis-3.0.0
- # make && make install
- # cd src
- # cp redis-trib.rb /usr/local/bin
- # mkdir /etc/redis
- # mkdir /var/log/redis
# wget http://download.redis.io/releases/redis-3.0.0.tar.gz
# tar -xvzf redis-3.0.0.tar.gz
# cd redis-3.0.0
# make && make install
# cd src
# cp redis-trib.rb /usr/local/bin # mkdir /etc/redis
# mkdir /var/log/redis
上述操作要先在二台机器上面都操作好。
2,配置redis
- [root@slave2 redis-3.0.0]# vim redis.conf //解压的根目录,有redis.conf,做以下修改
- port 6379
- pidfile /var/run/redis-6379.pid
- dbfilename dump-6379.rdb
- appendfilename "appendonly-6379.aof"
- cluster-config-file nodes-6379.conf
- cluster-enabled yes
- cluster-node-timeout 5000
- appendonly yes
[root@slave2 redis-3.0.0]# vim redis.conf //解压的根目录,有redis.conf,做以下修改
port 6379
pidfile /var/run/redis-6379.pid
dbfilename dump-6379.rdb
appendfilename "appendonly-6379.aof"
cluster-config-file nodes-6379.conf
cluster-enabled yes
cluster-node-timeout 5000
appendonly yes
3,copy配置文件,并修改端口
- # cp redis.conf /etc/redis/redis-6379.conf
- # cp redis.conf /etc/redis/redis-6380.conf
- # cp redis.conf /etc/redis/redis-6381.conf
- # scp redis.conf 192.168.10.220:/etc/redis/redis-6382.conf
- # scp redis.conf 192.168.10.220:/etc/redis/redis-6383.conf
- # scp redis.conf 192.168.10.220:/etc/redis/redis-6384.conf
- # sed -i "s/6379/6380/g" /etc/redis/redis-6380.conf
- # sed -i "s/6379/6381/g" /etc/redis/redis-6381.conf
- # sed -i "s/6379/6382/g" /etc/redis/redis-6382.conf
- # sed -i "s/6379/6383/g" /etc/redis/redis-6383.conf
- # sed -i "s/6379/6384/g" /etc/redis/redis-6384.conf
# cp redis.conf /etc/redis/redis-6379.conf
# cp redis.conf /etc/redis/redis-6380.conf
# cp redis.conf /etc/redis/redis-6381.conf # scp redis.conf 192.168.10.220:/etc/redis/redis-6382.conf
# scp redis.conf 192.168.10.220:/etc/redis/redis-6383.conf
# scp redis.conf 192.168.10.220:/etc/redis/redis-6384.conf # sed -i "s/6379/6380/g" /etc/redis/redis-6380.conf
# sed -i "s/6379/6381/g" /etc/redis/redis-6381.conf # sed -i "s/6379/6382/g" /etc/redis/redis-6382.conf
# sed -i "s/6379/6383/g" /etc/redis/redis-6383.conf
# sed -i "s/6379/6384/g" /etc/redis/redis-6384.conf
将配置文件分别copy到二台机器上,并替换端口:
- # cat redis-6380.conf |awk '{if($0 !~ /^$/ && $0 !~ /#/) {print $0}}' |grep 6380
- pidfile /var/run/redis-6380.pid
- port 6380
- dbfilename dump-6380.rdb
- appendfilename "appendonly-6380.aof"
- cluster-config-file nodes-6380.conf
# cat redis-6380.conf |awk '{if($0 !~ /^$/ && $0 !~ /#/) {print $0}}' |grep 6380
pidfile /var/run/redis-6380.pid
port 6380
dbfilename dump-6380.rdb
appendfilename "appendonly-6380.aof"
cluster-config-file nodes-6380.conf
有5处修改端口的地方
4,启动并查看redis
- # redis-server /etc/redis/redis-6379.conf > /var/log/redis/redis-6379.log 2>&1 &
- # redis-server /etc/redis/redis-6380.conf > /var/log/redis/redis-6380.log 2>&1 &
- # redis-server /etc/redis/redis-6381.conf > /var/log/redis/redis-6381.log 2>&1 &
- # redis-server /etc/redis/redis-6382.conf > /var/log/redis/redis-6382.log 2>&1 &
- # redis-server /etc/redis/redis-6383.conf > /var/log/redis/redis-6383.log 2>&1 &
- # redis-server /etc/redis/redis-6384.conf > /var/log/redis/redis-6384.log 2>&1 &
- # netstat -tpnl |grep redis
- tcp 0 0 0.0.0.0:6379 0.0.0.0:* LISTEN 7298/redis-server *
- tcp 0 0 0.0.0.0:6380 0.0.0.0:* LISTEN 7299/redis-server *
- tcp 0 0 0.0.0.0:6381 0.0.0.0:* LISTEN 7304/redis-server *
- tcp 0 0 0.0.0.0:16379 0.0.0.0:* LISTEN 7298/redis-server *
- tcp 0 0 0.0.0.0:16380 0.0.0.0:* LISTEN 7299/redis-server *
- tcp 0 0 0.0.0.0:16381 0.0.0.0:* LISTEN 7304/redis-server *
- tcp 0 0 :::6379 :::* LISTEN 7298/redis-server *
- tcp 0 0 :::6380 :::* LISTEN 7299/redis-server *
- tcp 0 0 :::6381 :::* LISTEN 7304/redis-server *
- tcp 0 0 :::16379 :::* LISTEN 7298/redis-server *
- tcp 0 0 :::16380 :::* LISTEN 7299/redis-server *
- tcp 0 0 :::16381 :::* LISTEN 7304/redis-server *
- [root@slave2 redis]# ll /etc/redis/
- 总用量 156
- -rw-r--r-- 1 root root 0 4月 30 23:54 appendonly-6379.aof
- -rw-r--r-- 1 root root 0 5月 1 00:08 appendonly-6380.aof
- -rw-r--r-- 1 root root 0 5月 1 00:08 appendonly-6381.aof
- -rw-r--r-- 1 root root 18 5月 1 00:08 dump-6379.rdb
- -rw-r--r-- 1 root root 18 5月 1 00:08 dump-6380.rdb
- -rw-r--r-- 1 root root 18 5月 1 00:08 dump-6381.rdb
- -rw-r--r-- 1 root root 763 5月 1 00:08 nodes-6379.conf
- -rw-r--r-- 1 root root 763 5月 1 00:08 nodes-6380.conf
- -rw-r--r-- 1 root root 763 5月 1 00:08 nodes-6381.conf
- -rw-r--r-- 1 root root 41412 4月 30 23:30 redis-6379.conf
- -rw-r--r-- 1 root root 41412 4月 30 23:39 redis-6380.conf
- -rw-r--r-- 1 root root 41412 4月 30 23:39 redis-6381.conf
# redis-server /etc/redis/redis-6379.conf > /var/log/redis/redis-6379.log 2>&1 &
# redis-server /etc/redis/redis-6380.conf > /var/log/redis/redis-6380.log 2>&1 &
# redis-server /etc/redis/redis-6381.conf > /var/log/redis/redis-6381.log 2>&1 & # redis-server /etc/redis/redis-6382.conf > /var/log/redis/redis-6382.log 2>&1 &
# redis-server /etc/redis/redis-6383.conf > /var/log/redis/redis-6383.log 2>&1 &
# redis-server /etc/redis/redis-6384.conf > /var/log/redis/redis-6384.log 2>&1 & # netstat -tpnl |grep redis
tcp 0 0 0.0.0.0:6379 0.0.0.0:* LISTEN 7298/redis-server *
tcp 0 0 0.0.0.0:6380 0.0.0.0:* LISTEN 7299/redis-server *
tcp 0 0 0.0.0.0:6381 0.0.0.0:* LISTEN 7304/redis-server *
tcp 0 0 0.0.0.0:16379 0.0.0.0:* LISTEN 7298/redis-server *
tcp 0 0 0.0.0.0:16380 0.0.0.0:* LISTEN 7299/redis-server *
tcp 0 0 0.0.0.0:16381 0.0.0.0:* LISTEN 7304/redis-server *
tcp 0 0 :::6379 :::* LISTEN 7298/redis-server *
tcp 0 0 :::6380 :::* LISTEN 7299/redis-server *
tcp 0 0 :::6381 :::* LISTEN 7304/redis-server *
tcp 0 0 :::16379 :::* LISTEN 7298/redis-server *
tcp 0 0 :::16380 :::* LISTEN 7299/redis-server *
tcp 0 0 :::16381 :::* LISTEN 7304/redis-server * [root@slave2 redis]# ll /etc/redis/
总用量 156
-rw-r--r-- 1 root root 0 4月 30 23:54 appendonly-6379.aof
-rw-r--r-- 1 root root 0 5月 1 00:08 appendonly-6380.aof
-rw-r--r-- 1 root root 0 5月 1 00:08 appendonly-6381.aof
-rw-r--r-- 1 root root 18 5月 1 00:08 dump-6379.rdb
-rw-r--r-- 1 root root 18 5月 1 00:08 dump-6380.rdb
-rw-r--r-- 1 root root 18 5月 1 00:08 dump-6381.rdb
-rw-r--r-- 1 root root 763 5月 1 00:08 nodes-6379.conf
-rw-r--r-- 1 root root 763 5月 1 00:08 nodes-6380.conf
-rw-r--r-- 1 root root 763 5月 1 00:08 nodes-6381.conf
-rw-r--r-- 1 root root 41412 4月 30 23:30 redis-6379.conf
-rw-r--r-- 1 root root 41412 4月 30 23:39 redis-6380.conf
-rw-r--r-- 1 root root 41412 4月 30 23:39 redis-6381.conf
所有节点都启动成功,并不代表,他们就是集群了。
四,创建集群,并查看
1,创建redis集群
- # redis-trib.rb create --replicas 1 192.168.10.219:6379 192.168.10.219:6380 192.168.10.219:6381 192.168.10.220:6382 192.168.10.220:6383 192.168.10.220:6384
# redis-trib.rb create --replicas 1 192.168.10.219:6379 192.168.10.219:6380 192.168.10.219:6381 192.168.10.220:6382 192.168.10.220:6383 192.168.10.220:6384
2,查看redis集群状态
- [root@slave2 redis]# redis-trib.rb check 192.168.10.219:6379
- Connecting to node 192.168.10.219:6379: OK
- Connecting to node 192.168.10.220:6384: OK
- Connecting to node 192.168.10.219:6381: OK
- Connecting to node 192.168.10.220:6383: OK
- Connecting to node 192.168.10.220:6382: OK
- Connecting to node 192.168.10.219:6380: OK
- >>> Performing Cluster Check (using node 192.168.10.219:6379)
- M: d40d9a367c24784b0336c7b80fb4c87337e2cba6 192.168.10.219:6379
- slots:5461-10922 (5462 slots) master
- 1 additional replica(s)
- S: 5f00f163d0c0a540ea99daf004f55588a802327b 192.168.10.220:6384
- slots: (0 slots) slave
- replicates d40d9a367c24784b0336c7b80fb4c87337e2cba6
- S: b3b1a848987b5a87a06888e126d5c9b16f871ff5 192.168.10.219:6381
- slots: (0 slots) slave
- replicates d2eb5a8a77f87888792428aed4692dfb907e7a1d
- M: d2eb5a8a77f87888792428aed4692dfb907e7a1d 192.168.10.220:6383
- slots:10923-16383 (5461 slots) master
- 1 additional replica(s)
- M: a8eafe8b19d6a28c034917da13a43ce1230fe870 192.168.10.220:6382
- slots:0-5460 (5461 slots) master
- 1 additional replica(s)
- S: a87d207204a53ab599bf7f6ffb9d679d0eef4f25 192.168.10.219:6380
- slots: (0 slots) slave
- replicates a8eafe8b19d6a28c034917da13a43ce1230fe870
- [OK] All nodes agree about slots configuration.
- >>> Check for open slots...
- >>> Check slots coverage...
- [OK] All 16384 slots covered.
[root@slave2 redis]# redis-trib.rb check 192.168.10.219:6379
Connecting to node 192.168.10.219:6379: OK
Connecting to node 192.168.10.220:6384: OK
Connecting to node 192.168.10.219:6381: OK
Connecting to node 192.168.10.220:6383: OK
Connecting to node 192.168.10.220:6382: OK
Connecting to node 192.168.10.219:6380: OK
>>> Performing Cluster Check (using node 192.168.10.219:6379)
M: d40d9a367c24784b0336c7b80fb4c87337e2cba6 192.168.10.219:6379
slots:5461-10922 (5462 slots) master
1 additional replica(s)
S: 5f00f163d0c0a540ea99daf004f55588a802327b 192.168.10.220:6384
slots: (0 slots) slave
replicates d40d9a367c24784b0336c7b80fb4c87337e2cba6
S: b3b1a848987b5a87a06888e126d5c9b16f871ff5 192.168.10.219:6381
slots: (0 slots) slave
replicates d2eb5a8a77f87888792428aed4692dfb907e7a1d
M: d2eb5a8a77f87888792428aed4692dfb907e7a1d 192.168.10.220:6383
slots:10923-16383 (5461 slots) master
1 additional replica(s)
M: a8eafe8b19d6a28c034917da13a43ce1230fe870 192.168.10.220:6382
slots:0-5460 (5461 slots) master
1 additional replica(s)
S: a87d207204a53ab599bf7f6ffb9d679d0eef4f25 192.168.10.219:6380
slots: (0 slots) slave
replicates a8eafe8b19d6a28c034917da13a43ce1230fe870
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
到这儿,redis集群就配置成功了
五,测试redis集群
- # redis-cli -c -p 6379 -h 192.168.10.219 //在219登录
- 192.168.10.219:6379> set tank tank1 //设置测试值
- -> Redirected to slot [4407] located at 192.168.10.220:6382
- OK //直接转向到220 6382端口,数据存到了220 6382,不过有点奇怪
- 192.168.10.220:6382> get tank //可以取到值
- "tank1"
- [root@manage redis]# redis-cli -c -p 6383 -h 192.168.10.220 //220机器,6383端口
- 192.168.10.220:6383> get tank
- -> Redirected to slot [4407] located at 192.168.10.220:6382 //直接转向220 6382端口
- "tank1"
- [root@manage redis]# ps aux |grep redis //查看进程
- root 7310 0.2 0.9 137436 9724 pts/0 Sl Apr30 0:09 redis-server *:6382 [cluster]
- root 7311 0.2 0.9 137436 9776 pts/0 Sl Apr30 0:09 redis-server *:6383 [cluster]
- root 7316 0.2 0.9 137436 9944 pts/0 Sl Apr30 0:10 redis-server *:6384 [cluster]
- root 7478 0.0 0.0 103256 812 pts/0 S+ 00:56 0:00 grep redis
- [root@manage redis]# kill -9 7310 //关闭220 6382端口,看数据会不会丢失
- [root@slave2 redis]# redis-trib.rb check 192.168.10.219:6379 //查看集群情况,任何接口都行
- Connecting to node 192.168.10.219:6379: OK
- Connecting to node 192.168.10.220:6384: OK
- Connecting to node 192.168.10.219:6381: OK
- Connecting to node 192.168.10.220:6383: OK
- Connecting to node 192.168.10.219:6380: OK
- >>> Performing Cluster Check (using node 192.168.10.219:6379)
- M: d40d9a367c24784b0336c7b80fb4c87337e2cba6 192.168.10.219:6379
- slots:5461-10922 (5462 slots) master
- 1 additional replica(s)
- S: 5f00f163d0c0a540ea99daf004f55588a802327b 192.168.10.220:6384
- slots: (0 slots) slave
- replicates d40d9a367c24784b0336c7b80fb4c87337e2cba6
- S: b3b1a848987b5a87a06888e126d5c9b16f871ff5 192.168.10.219:6381
- slots: (0 slots) slave
- replicates d2eb5a8a77f87888792428aed4692dfb907e7a1d
- M: d2eb5a8a77f87888792428aed4692dfb907e7a1d 192.168.10.220:6383
- slots:10923-16383 (5461 slots) master
- 1 additional replica(s)
- M: a87d207204a53ab599bf7f6ffb9d679d0eef4f25 192.168.10.219:6380
- slots:0-5460 (5461 slots) master
- 0 additional replica(s)
- [OK] All nodes agree about slots configuration.
- >>> Check for open slots...
- >>> Check slots coverage...
- [OK] All 16384 slots covered. //变成,三主二从了
- [root@slave2 redis]# redis-cli -c -p 6379 -h 192.168.10.219 //219登录
- 192.168.10.219:6379> get tank
- -> Redirected to slot [4407] located at 192.168.10.219:6380 //数据被转到了6380节点了
- "tank1"
# redis-cli -c -p 6379 -h 192.168.10.219 //在219登录
192.168.10.219:6379> set tank tank1 //设置测试值
-> Redirected to slot [4407] located at 192.168.10.220:6382
OK //直接转向到220 6382端口,数据存到了220 6382,不过有点奇怪
192.168.10.220:6382> get tank //可以取到值
"tank1" [root@manage redis]# redis-cli -c -p 6383 -h 192.168.10.220 //220机器,6383端口
192.168.10.220:6383> get tank
-> Redirected to slot [4407] located at 192.168.10.220:6382 //直接转向220 6382端口
"tank1" [root@manage redis]# ps aux |grep redis //查看进程
root 7310 0.2 0.9 137436 9724 pts/0 Sl Apr30 0:09 redis-server *:6382 [cluster]
root 7311 0.2 0.9 137436 9776 pts/0 Sl Apr30 0:09 redis-server *:6383 [cluster]
root 7316 0.2 0.9 137436 9944 pts/0 Sl Apr30 0:10 redis-server *:6384 [cluster]
root 7478 0.0 0.0 103256 812 pts/0 S+ 00:56 0:00 grep redis [root@manage redis]# kill -9 7310 //关闭220 6382端口,看数据会不会丢失 [root@slave2 redis]# redis-trib.rb check 192.168.10.219:6379 //查看集群情况,任何接口都行
Connecting to node 192.168.10.219:6379: OK
Connecting to node 192.168.10.220:6384: OK
Connecting to node 192.168.10.219:6381: OK
Connecting to node 192.168.10.220:6383: OK
Connecting to node 192.168.10.219:6380: OK
>>> Performing Cluster Check (using node 192.168.10.219:6379)
M: d40d9a367c24784b0336c7b80fb4c87337e2cba6 192.168.10.219:6379
slots:5461-10922 (5462 slots) master
1 additional replica(s)
S: 5f00f163d0c0a540ea99daf004f55588a802327b 192.168.10.220:6384
slots: (0 slots) slave
replicates d40d9a367c24784b0336c7b80fb4c87337e2cba6
S: b3b1a848987b5a87a06888e126d5c9b16f871ff5 192.168.10.219:6381
slots: (0 slots) slave
replicates d2eb5a8a77f87888792428aed4692dfb907e7a1d
M: d2eb5a8a77f87888792428aed4692dfb907e7a1d 192.168.10.220:6383
slots:10923-16383 (5461 slots) master
1 additional replica(s)
M: a87d207204a53ab599bf7f6ffb9d679d0eef4f25 192.168.10.219:6380
slots:0-5460 (5461 slots) master
0 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered. //变成,三主二从了 [root@slave2 redis]# redis-cli -c -p 6379 -h 192.168.10.219 //219登录
192.168.10.219:6379> get tank
-> Redirected to slot [4407] located at 192.168.10.219:6380 //数据被转到了6380节点了
"tank1"
经测试,集群是可用的。
http://blog.51yip.com/nosql/1725.html
redis cluster 集群 安装 配置 详解的更多相关文章
- hadoop1.2.1+zk-3.4.5+hbase-0.94.1集群安装过程详解
hadoop1.2.1+zk-3.4.5+hbase-0.94.1集群安装过程详解 一,环境: 1,主机规划: 集群中包括3个节点:hadoop01为Master,其余为Salve,节点之间局域网连接 ...
- 2、Redis 底层原理:Cluster 集群部署与详解
Redis 简介 Redis 提供数据缓存服务,内部数据都存在内存中,所以访问速度非常快. 早期,Redis 单应用服务亦能满足企业的需求.之后,业务量的上升,单机的读写能力满足不了业务的需求,技术上 ...
- rocketmq集群、配置详解和常用命令
集群原文地址: http://www.cnblogs.com/520playboy/p/6716235.html 常用命令原文地址: http://www.cnblogs.com/gmq-sh/p/6 ...
- Redis3.0.7 cluster/集群 安装配置教程
1.前言 环境:CentOS-6.7-i386-LiveDVD 安装的CentOs系统 节点: 6个节点,3个主节点.3个从节点(由于redis默认需要3个主节点,如果想每个主节点有一个从节点,这是最 ...
- Elasticsearch集群节点配置详解
注意:如果是在局域网中运行elasticsearch集群也是很简单的,只要cluster.name设置一致,并且机器在同一网段下,启动的es会自动发现对方,组成集群. 2.elasticsearch- ...
- RabbitMQ 集群安装过程详解
一.安装Erlang 1.rabbitMQ是基于erlang的,所以首先必须配置erlang环境. 从erlang官网下载 otp 18.3.下载链接:http://erlang.org/downlo ...
- CentOS下Redis 2.2.14安装配置详解(转载)
一. 下载redis最新版本2.2.14 cd /usr/local/src wget –c http://redis.googlecode.com/files/redis-2.2.14.tar.gz ...
- 深入分析redis cluster 集群
深入分析redis cluster 集群安装配置详解 下面小编来为各位介绍一篇深入分析redis cluster 集群安装配置详解,如果你希望做数据库集群就可以来看看此文章的哦. http://rub ...
- centos6下redis cluster集群部署过程
一般来说,redis主从和mysql主从目的差不多,但redis主从配置很简单,主要在从节点配置文件指定主节点ip和端口,比如:slaveof 192.168.10.10 6379,然后启动主从,主从 ...
随机推荐
- 2019.10.28sql注入工具
SQLMAP工具的使用 sql注入工具:明小子 啊D 萝卜头 穿山甲 sqlmap等等 开源自动化注入利用工具,支持12中数据库,在/plugins中可以看到支持的数据库种类 支持的注入类型:bool ...
- Firefox 的User Agent 将移除 CPU 架构信息
Mozilla 计划从 Firefox 的 User Agent(用户代理)和几个支持的 API 中移除 CPU 架构信息,以减少 Firefox 用户的“数字指纹”.Web 浏览器会自动向用户在应用 ...
- automake中Makefile.am和configure.ac的格式及编译过程
step1:写Makefile.am step2:执行autoscan,会生成configurae.scan,修改configure.scan内容之后,命名为configure.ac step3:执行 ...
- echo(),print(),print_r()的区别?
echo可以一次输出多个值,多个值之间用逗号分隔.echo是语言结构(language construct),而并不是真正的函数,因此不能作为表达式的一部分使用.echo是php的内部指令,不是函数, ...
- Highcharts基本名词解释
1.Highcharts基本组成: 2.名词解释 lang 语言文字对象 所有Highcharts文字相关的设置 chart 图表 图表区.图形区和通用图表配置选项 colors 颜色 图表数据列颜色 ...
- 兼容系列-IE678的兼容
1. 最简单的CSS Hack 区分 IE6 . IE7 .IE8 css .color{ background-color: #CC00FF; /*所有浏览器都会显示为紫色*/ background ...
- Kendo UI for jQuery使用教程:方法和事件
[Kendo UI for jQuery最新试用版下载] Kendo UI目前最新提供Kendo UI for jQuery.Kendo UI for Angular.Kendo UI Support ...
- Greenplum 日常维护
1. 数据库启动:gpstart 常用可选参数: -a : 直接启动,不提示终端用户输入确认 -m:只启动master 实例,主要在故障处理时使用 2. 数据库停止:gpstop: 常用可选参数:-a ...
- 一种sqlor的拆分
原脚本declare @Phone nvarchar(50)declare @CompanyNO nvarchar(50)set @Phone='13914124223'set @CompanyNO= ...
- Java中 DecimalFormat 用法详解
我们经常要将数字进行格式化,比如取2位小数,这是最常见的.Java 提供DecimalFormat类,帮你用最快的速度将数字格式化为你需要的样子.下面是一个例子: import java.text.D ...