• 为防火墙增加开放端口

    /sbin/iptables -I INPUT -p tcp –dport 80 -j ACCEPT
    /etc/rc.d/init.d/iptables save
    /etc/init.d/iptables restart

    –centos 强制释放系统内存

    # sysctl -w vm.drop_caches=3

  • rsync服务的安装和使用

    服务器端配置:
    # yum -y install xinetd

    # vi /etc/xinetd.d/rsync
    将如下代码

    service rsync
    {
    disable = yes
    socket_type = stream
    wait = no
    user = root
    server = /usr/bin/rsync
    server_args = –daemon
    log_on_failure += USERID
    }
    中的 disable = yes 改成 disable = no

    然后启动 xinetd
    # /etc/init.d/xinetd start 或 service xinetd restart
    注意:如果服务器上装有防火墙记得要打开端口,默认端口是873

    # vi /etc/rsyncd.conf
    [download]
    path=/data/download
    read only=yes
    uid=nobody
    gid=nobody
    hosts allow=*

    rsync同步发送给目标服务:

    rsync -vzrtopg –progress –delete /test/aaa rsync://192.168.1.1:873/data/test

    其中 data 是 目标机器 rsync 服务的模块

    其他不想关的命令:

    查看分隔符文件指定列的值(列编号从1开始):

    awk -F ^A ‘{if ($2!=0 && $3==81065 && $5==207817) print }’ xxxx.log.20140828* | wc -l

    其中的 ^A 是 unicode \u0001 ,可使用 ctrl + v + a 打出来。

    tcp 抓包:

    tcpdump -Avvnns 0 -i any ‘host xxx.com and (((ip[2:2] – ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)’

    命令返回和域名 xxx.com 交互的 tcp 数据包

  • redis安装和sentinel集群模式

    install:

    mkdir /data/download -p
    cd /data/download

    ///You need tcl 8.5 or newer in order to run the Redis test

    wget http://sourceforge.net/projects/tcl/files/Tcl/8.5.15/tcl8.5.15-src.tar.gz/download
    tar xzvf tcl8.5.15-src.tar.gz -C tcl8.5.15-src
    cd tcl8.5.15-src/unix/
    ./configure –prefix=/data/lib/tcl8.5.15
    make
    make install
    ln -s tcl8.5.15 tcl

    export PATH=/data/lib/tcl/bin:$PATH
    #export LD_LIBRARY_PATH=/data/lib/tcl/lib:$LD_LIBRARY_PATH

    wget wget http://download.redis.io/releases/redis-2.8.13.tar.gz
    tar -xf redis-2.8.13.tar.gz
    cd redis-2.8.13
    make
    #make test
    #make PREFIX=/data/lib/redis install

    make PREFIX=/data/lib/bin/redis-2.8.13 install

    cd /data/lib/redis
    mkdir conf
    mkdir logs
    mkdir var
    cp /data/lib/redis-stable/redis.conf /data/lib/redis/conf

    ——————————————————-
    $ pwd
    ——————————————————-

    /home/redis/app/redis

    ——————————————————-
    $ ll bin
    ——————————————————-

    -rwxr-xr-x 1 redis redis 4580235 Jul 28 16:16 redis-benchmark
    -rwxr-xr-x 1 redis redis 22233 Jul 28 16:16 redis-check-aof
    -rwxr-xr-x 1 redis redis 45467 Jul 28 16:16 redis-check-dump
    -rwxr-xr-x 1 redis redis 4675985 Jul 28 16:16 redis-cli
    -rwxr-xr-x 1 redis redis 6201291 Jul 28 16:17 redis-sentinel
    -rwxr-xr-x 1 redis redis 6201291 Jul 28 16:16 redis-server

    ——————————————————-
    $ ll
    ——————————————————-

    drwxrwxr-x 2 redis redis 4096 Jul 28 16:17 bin
    drwxrwxr-x 2 redis redis 4096 Jul 28 20:13 conf
    drwxrwxr-x 2 redis redis 4096 Jul 30 17:55 data
    drwxrwxr-x 2 redis redis 4096 Jul 28 19:44 logs
    -rwxr-xr-x 1 redis redis 108 Jul 28 16:15 shutdown.sh
    -rwxr-xr-x 1 redis redis 106 Jul 28 16:40 startup.sh
    -rwxr-xr-x 1 redis redis 79 Jul 28 20:12 stn-shutdown.sh
    -rwxr-xr-x 1 redis redis 138 Jul 28 17:03 stn-startup.sh
    drwxrwxr-x 2 redis redis 4096 Jul 28 15:00 temp
    drwxrwxr-x 2 redis redis 4096 Jul 28 20:19 var

    ——————————————————-
    $ cat stn.conf
    ——————————————————-
    port 26379
    dir “/data/redis/app/redis-2.8.13/temp”
    sentinel monitor mymaster 172.16.16.156 6379 2
    sentinel down-after-milliseconds mymaster 10000
    sentinel auth-pass mymaster password
    sentinel config-epoch mymaster 1
    sentinel leader-epoch mymaster 1

    # Generated by CONFIG REWRITE
    sentinel known-slave mymaster 172.16.16.155 6379
    sentinel known-slave mymaster 172.16.16.157 6379
    sentinel known-sentinel mymaster 172.16.16.156 26379 89348644a66ba88bf7dec6d67a6e210080576051
    sentinel known-sentinel mymaster 172.16.16.157 26379 e4104de666d036dbbb3c47926b1b9a3177ec1549

    sentinel current-epoch 1

    ——————————————————-
    cat startup.sh
    ——————————————————-

    # start redis in sentinel mode
    export pwd=`dirname “$0″`
    $pwd/bin/redis-server $pwd/conf/redis.conf

    ——————————————————-
    cat shutdown.sh
    ——————————————————-

    # shutdown redis
    export pwd=`dirname “$0″`
    $pwd/bin/redis-cli -h 127.0.0.1 -p 6379 -a password shutdown

    ——————————————————-
    cat stn-startup.sh
    ——————————————————-

    # start redis in sentinel mode
    export pwd=`dirname “$0″`
    $pwd/bin/redis-server $pwd/conf/stn.conf –sentinel >> $pwd/logs/stn.log &

    ——————————————————-
    cat stn-shutdown.sh
    ——————————————————-

    kill -9 `ps -ef | grep -v grep | grep redis | grep 26379 | awk ‘{print $2}’`

    ——————————————————-