大数据 - Contos7安装及配置

1. 关闭防火墙
   systemctl stop firewalld
   systemctl disable firewalld

2. 禁用 SELinux 安全策略
   setenforce 0
   vi /etc/selinux/config
   将 SELINUX 值修改为 disable 重启服务器使其生效 reboot

3. 优化服务器网络环境配置 vi /etc/sysctl.conf

net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
vm.swappiness = 0
net.ipv4.neigh.default.gc_stale_time=120
# see details in https://help.aliyun.com/knowledge_detail/39428.html
net.ipv4.conf.all.rp_filter=0
# net.ipv4.conf.default.rp_filter=0
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.lo.arp_announce=2
net.ipv4.conf.all.arp_announce=2
# see details in https://help.aliyun.com/knowledge_detail/41334.html
# net.ipv4.tcp_max_tw_buckets = 5000
# net.ipv4.tcp_syncookies = 1
# net.ipv4.tcp_max_syn_backlog = 1024
net.ipv4.tcp_synack_retries = 2
net.ipv4.ip_forward = 0
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.accept_source_route = 0
kernel.sysrq = 0
kernel.core_uses_pid = 1
net.ipv4.tcp_syncookies = 1
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.shmmax = 68719476736
kernel.shmall = 4294967296
net.ipv4.tcp_max_tw_buckets = 6000
net.ipv4.tcp_sack = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_rmem = 4096 87380 4194304
net.ipv4.tcp_wmem = 4096 16384 4194304
net.core.wmem_default = 8388608
net.core.rmem_default = 8388608
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.core.netdev_max_backlog = 262144
# net.core.somaxconn = 262144
net.core.somaxconn = 2048
net.ipv4.tcp_max_orphans = 3276800
net.ipv4.tcp_max_syn_backlog = 262144
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_syn_retries = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_mem = 94500000 915000000 927000000
net.ipv4.tcp_fin_timeout = 1
net.ipv4.tcp_keepalive_time = 10
net.ipv4.tcp_keepalive_probes=5
net.ipv4.ip_local_port_range = 1024 65535
vm.overcommit_memory = 1
fs.file-max = 1024000

5. 运行命令，让配置生效 sysctl -p
6. 设置打开文件数限制 vi /etc/security/limits.conf

添加如下内容：
root hard nofile 1024000
root soft nofile 1024000
* soft nofile 1024000
* hard nofile 1024000

7. 输入命令 vi /etc/rc.local

添加下面代码             
    ulimit -SHn 1024000

8. 重启服务器输入下面命令查看是否生效 ulimit -n

9. 更新 yum ：在使用 yum 安装各种工具包时，由于使用的源默认是国外的，所以有时有一些源由于网络或什么原因会安装不上，所以可以通过更改 yum 安装源来提升安装效率，下面是使用阿里源（也可以更换为网易源，主要看你的网络连接哪个快）执行下面命令

	yum install wget -y
	mv /etc/yum.repos.d/CentOS-base.repo /etc/yum.repos.d/CentOSbase.repo.backup
	cd /etc/yum.repos.d/
	wget -O CentOS-base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
	yum makecache
	yum -y update    时间挺久  耐心等待，使用 yum 升级，会同时将内核一些程序也升级

10. 安装常用工具包,依次执行如下命令

yum install pcre-devel -y
yum install openssl openssl-devel -y
yum install gcc gcc-c++ ncurses-devel perl -y
yum install zlib zlib-devel rsync xinetd -y
yum install lrzsz libxml2 -y
yum install kernel-devel libxslt-devel libpqxx-devel libffi-devel python-devel libpq-dev -y

11. 配置静态ip

vi /etc/sysconfig/network-scripts/ifcfg-ens33
  将  BOOTPROTO="dhcp"    改成    BOOTPROTO=static
  #添加如下内容
 	IPADDR=192.168.0.249   #自己的
	NETMASK=255.255.255.0
	GATEWAY=192.168.0.1
	DNS1=114.114.114.114
	 #重启CentOS7的网络服务      
	systemctl restart network

12. 测试是否可以联网 ping www.baidu.com