CentOS7 编译安装LVS 互为主备CentOS7 编译安装LVS 互为主备 (实测笔记 Centos 7.0 + ipvsadm 1.27 + keepalived 1.2.15 LVS DR模式)
环境：
系统硬件：vmware vsphere (CPU：2*4核，内存2G，双网卡)
LVS服务器（两台）：
系统：Centos7.0 64位（LVS+keepalived）
LvsMaster:192.168.1.21 (主VIP：192.168.1.20 ，备VIP：192.168.1.18)
LvsBackup:192.168.1.22 (主VIP：192.168.1.18 ，备VIP：192.168.1.20)
Nginx服务器（三台）：
系统：Centos7.0 64位（Nginx服务，VIP:192.168.1.18）
IIS01:192.168.1.31
IIS02:192.168.1.32
IIS03:192.168.1.33
IIS服务器（三台）：
系统：Windwos2008R2 64位（ IIS服务，VIP:192.168.1.20）
IIS01:192.168.1.41
IIS02:192.168.1.42
IIS03:192.168.1.43
RealServer 安装步骤：
1.安装Web服务器（Linxu，nginx，主网卡接口名称：ens192）
此处以服务器：web01，IP地址为：192.168.1.31说明（另外两台参考此处）
1.1 安装系统（假定已经安装好系统，并且已经能够正常提供Nginx服务）
[root@web01 ~]# cat /etc/redhat-release
CentOS Linux release 7.0.1406 (Core)
[root@web01 ~]# uname -rs
Linux 3.10.0-123.20.1.el7.x86_64
修改主机名
[root@web01 ~]# hostnamectl set-hostname web01
[root@web01 ~]#hostname
web01
[root@web01~]# ip add show ens192
2:ens192: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen1000
link/ether 00:50:56:94:02:4a brd ff:ff:ff:ff:ff:ff
inet 192.168.1.31/24 brd 192.168.1.255 scope global ens192
valid_lft forever preferred_lft forever
inet6 fe80::250:56ff:fe94:24a/64 scope link
valid_lft forever preferred_lft forever
[root@web01~]# curl http://192.168.1.31
<html>
<head>
<title>Web 01 10:43:18</title>
</head>
<body>
<h1>Web Server 01 index.html</h1>
<p>2015-03-17 10:43:18</p>
</body>
</html>
1.2 设置服务器，以支持vip访问
方法1：直接创建lo:0文件，并且绑定VIP（192.168.1.18）
[root@web01~]# vim /etc/sysconfig/network-scripts/ifcfg-lo:0
打开编辑器，输入以下内容
DEVICE=lo:0
IPADDR=192.168.1.18
NETMASK=255.255.255.255
ONBOOT=yes
NAME=loopback
保存、退出
重启
[root@web01~]# shutdown -r now
测试是否绑定VIP
[root@web01~]# ip add show lo:0
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet 192.168.1.18/32 brd 192.168.1.18 scope global lo:0
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
显示绑定即inet 192.168.1.18/32 brd 192.168.1.18 scope globallo:0
解决ARP问题
[root@web01~]# vim /etc/sysctl.conf
打开编辑器，输入以下内容
net.ipv4.conf.lo.arp_ignore= 1
net.ipv4.conf.lo.arp_announce = 2
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2
保存、退出
设置即时生效
[root@web01 ~]# sysctl -f
设置说明
#arp_ignore=1，系统只回答目的IP为是本地IP的包。也就是对广播包不做响应。
#arp_announce=2，系统忽略IP包的源地址（source address），而根据目标主机（target host），选择本地地址。
#arp_ignore限制arp应答。限制等级：
#0：对于其它设备的arp请求，应答所有其它接口的上IP的arp应答
#1：对于其它设备的arp请求，只应答本接口上IP的arp应答
#arp_announce限制arp通告。限制等级：
#0：在接口上通告所有接口上IP的arp广播
#1：对于其它设备的arp请求，在接口上尽量限制广播通告应答（不够严格）
#2：只通告本接口上IP的arp广播
方法2：通过命令绑定绑定VIP（192.168.1.18）
[root@web01~]# vim /usr/local/sbin/lvs_realserver.sh
打开编辑器，输入以下内容
#!/bin/bash
VIP=192.168.1.18
/etc/rc.d/init.d/functions
case "$1" in
start)
ifconfig lo:0 $VIP netmask 255.255.255.255 broadcast $VIP
/sbin/route add -host $VIP dev lo:0
echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
sysctl -p >/dev/null 2>&1
echo "RealServer Start OK"
;;
stop)
ifconfig lo:0 down
route del $VIP >/dev/null 2>&1
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
echo "RealServer Stoped"
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
esac
exit 0
保存、退出
运行，查看是否生效，是否绑定VIP
[root@web01~]# /usr/local/sbin/lvs_realserver.sh start
[root@web01~]# ip add show lo:0
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet 192.168.1.18/32 brd 192.168.1.18 scope global lo:0
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
显示绑定即inet 192.168.1.18/32 brd192.168.1.18 scope global lo:0
设置自动启动
[root@web01~]# vim /etc/rc.d/rc.local
打开编辑器，添加以下内容
/usr/local/sbin/lvs_realserver.shstart
保存退出
设置运行权限（否则启动后，依然不会自动运行）
[root@web01~]#chmod 755 /etc/rc.d/rc.local
2.安装Web服务器（Windows2008r2，IIS，主网卡接口名称：本地连接）
此处以服务器：IIS01，IP地址为：192.168.1.41说明（另外两台参考此处)
2.1 安装系统（假定已经安装好系统，并且已经能够正常提供IIS服务）
IP地址：192.168.1.41
子网掩码：255.255.255.0
默认网关：192.168.1.1
首选DNS：192.168.1.1
网页内容：
<html>
<head>
<title>IIS 01 10:43:18</title>
</head>
<body>
<h1>IIS 01 index.html</h1>
<p>2015-03-17 10:43:18</p>
</body>
</html>
2.2 设置服务器，添加环回接口，以支持vip访问
打开设备管理器-右键服务器名-添加过时硬件-打开硬件添加向导
下一步-安装我手动从列表选择的硬件（高级）-下一步-打开安装的硬件类型
选择网络适配器-下一步
厂商选择（Microsoft），网络适配器选择（Microsoft Loopback Adapter）-下一步-下一步
点击完成
打开网络连接，修改Microsoft Loopback Adapter名称为realserver
打开realserverTCP/IPv4属性修改IP地址
IP地址：192.168.1.20
子网掩码：255.255.255.255
确认退出
运行cmd 打开命令行提示符窗口
运行以下命令修改网卡接口（即本地连接）、环回接口(即realserver) 连接模式，用于解决ARP问题（否则TCP的状态会一直处于SYN_RECV 状态）
netshinterface ipv4 set interface "本地连接" weakhostreceive=enabled
netshinterface ipv4 set interface "本地连接" weakhostsend=enabled
netshinterface ipv4 set interface "realserver" weakhostreceive=enabled
netshinterface ipv4 set interface "realserver" weakhostsend=enabled
netshinterface ipv4 set interface "loopback" weakhostreceive=enabled
netshinterface ipv4 set interface "loopback" weakhostsend=enabled
3.安装LVS服务器
（Linxu，ipvsadm，keepalived，主网卡接口名称：ens160）
此处以服务器：lvs_master，IP地址为：192.168.1.21说明（lvs_backup 参考此处）
3.1.安装lvs_master
安装CentOS-7.0-1406-x86_64-DVD.iso
3.2.更新
[root@centos ~]# yum update
[root@centos~]# cat /etc/redhat-release
CentOS Linux release 7.0.1406 (Core)
[root@centos ~]# uname -rs
Linux 3.10.0-123.20.1.el7.x86_64
3.3.安装基本软件包
[root@centos~]# yum install vim wget lsof gcc gcc-c++ bzip2 -y
[root@centos~]# yum install net-tools bind-utils -y
3.4.修改主机名
[root@localhost ~]# hostnamectl set-hostname lvs_master
[root@lvs_master~]# hostname
lvs_master
3.5.修改IP地址
[root@lvs_master ~]# vim /etc/sysconfig/network-scripts/ifcfg-ens160
TYPE="Ethernet"
BOOTPROTO="static"
DEFROUTE="yes"
PEERDNS="yes"
PEERROUTES="yes"
IPV4_FAILURE_FATAL="no"
IPV6INIT="yes"
IPV6_AUTOCONF="yes"
IPV6_DEFROUTE="yes"
IPV6_PEERDNS="yes"
IPV6_PEERROUTES="yes"
IPV6_FAILURE_FATAL="no"
NAME="ens160"
ONBOOT="yes"
HWADDR="00:50:56:94:46:f8"
IPADDR="192.168.1.21"
NETMASK="255.255.255.0"
GATEWAY="192.168.1.1"
确认修改，退出
lvs_backup服务器修改说明：
HWADDR="lvs_backup相应MAC地址"
IPADDR="192.168.1.22"
[root@lvs_master~]# ifconfig ens160
ens160: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.21 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 fe80::250:56ff:fe94:204c prefixlen 64 scopeid 0x20<link>
ether 00:50:56:94:20:4c txqueuelen 1000 (Ethernet)
RX packets 41559 bytes 59971168 (57.1 MiB)
RX errors 0 dropped 10 overruns 0 frame 0
TX packets 27992 bytes 2121802 (2.0 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
3.6.安装ipvsadm
[root@lvs_master~]# yum install ipvsadm -y
================================================================================
Package 架构版本源大小
================================================================================
正在安装:
ipvsadm x86_64 1.27-4.el7 base 44 k
事务概要
================================================================================
安装 1 软件包
[root@lvs_master ~]# ipvsadm --version
ipvsadm v1.27 2008/5/15 (compiled with popt and IPVS v1.2.1)
[root@lvs_master ~]# lsmod | grep ip_vs
ip_vs 136674 0
nf_conntrack 101024 9ip_vs,nf_nat,nf_nat_ipv4,nf_nat_ipv6,xt_conntrack,ip6table_nat,iptable_nat,nf_conntrack_ipv4,nf_conntrack_ipv6
libcrc32c 12644 2 xfs,ip_vs
3.7.安装keepalived
[root@lvs_mastersrc]# yum install kernel-devel -y
================================================================================
Package 架构版本源大小
================================================================================
正在安装:
kernel-devel x86_64 3.10.0-123.20.1.el7 updates 8.9 M
事务概要
================================================================================
安装 1 软件包
[root@lvs_mastersrc]# ls /usr/src/kernels/
3.10.0-123.20.1.el7.x86_64
[root@lvs_master src]# cd /usr/local/src
[root@lvs_mastersrc]# wget www.keepalived.org/software/keepalived-1.2.15.tar.gz
[root@lvs_mastersrc]# tar zvxf keepalived-1.2.15.tar.gz
[root@lvs_mastersrc]# cd keepalived-1.2.15
[root@lvs_master keepalived-1.2.15]# yum install popt-devel popt-staticlibnl-devel openssl-devel iptraf -y
[root@KEEP ~]# cd /data/keepalived/
[root@KEEP keepalived]# tar zxvf keepalived-1.2.15.tar.gz
[root@KEEP keepalived]# cd keepalived-1.2.15/
[root@KEEP keepalived-1.2.15]# ./configure--prefix=/usr/local/keepalived
[root@KEEP keepalived-1.2.15]# make
[root@KEEP keepalived-1.2.15]# make install
[root@KEEP keepalived-1.2.15]# ln -s/usr/local/keepalived/etc/keepalived/ /etc/
[root@KEEP keepalived-1.2.15]# ln -s /usr/local/keepalived/etc/rc.d/init.d/keepalived/etc/init.d/
[root@KEEP keepalived-1.2.15]# ln -s/usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
[root@KEEP keepalived-1.2.15]# ln -s/usr/local/keepalived/sbin/keepalived /usr/sbin/
[root@lvs_master keepalived-1.2.15]# ./configure--sysconfdir=/etc/ --sbindir=/usr/sbin/--with-kernel-dir=/usr/src/kernels/3.10.0-123.20.1.el7.x86_64/
Keepalived configuration
------------------------
Keepalived version : 1.2.15
Compiler : gcc
Compiler flags : -g -O2 -DFALLBACK_LIBNL1
Extra Lib : -lssl -lcrypto -lcrypt -lnl
Use IPVS Framework : Yes
IPVS sync daemon support : Yes
IPVS use libnl : Yes
fwmark socket support : Yes
Use VRRP Framework : Yes
Use VRRP VMAC : No
SNMP support : No
SHA1 support
Use Debug flags : No
[root@lvs_masterkeepalived-1.2.15]# make && make install
[root@lvs_masterkeepalived-1.2.15]# /usr/sbin/keepalived --version
Keepalived v1.2.15 (03/06,2015)
[root@lvs_masterkeepalived-1.2.15]# systemctl status keepalived
keepalived.service - SYSV: Start and stop Keepalived
Loaded: loaded (/etc/rc.d/init.d/keepalived)
Active: inactive (dead)
3.8.配置keepalived
[root@lvs_master/]# vim /etc/keepalived/keepalived.conf
打开编辑，修改
!Configuration File for keepalived
global_defs {
notification_email {
me@vicowong.com #警报接收邮件
}
notification_email_from root@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_MASTER #lvs_backup 将LVS_MASTER修改为LVS_BACKUP
}
vrrp_instanceVI_IIS {
state MASTER #lvs_backup将MASTER改为BACKUP
interface ens160 #HA监测网络接口
virtual_router_id 51 #主、备机的virtual_router_id一定要相同，必须相同！
priority 120 #lvs_backup将120改为80
advert_int 1 #VRRP Multicast广播周期秒数
authentication {
auth_type PASS #VRRP认证方式
auth_pass 1111 #VRRP口令字
}
virtual_ipaddress {
192.168.1.20 #LVS虚拟地址
}
}
virtual_server192.168.1.20 80 {
delay_loop 2 #延时等待时间
lb_algo wrr #轮询算法
lb_kind DR #传输模式
persistence_timeout 1 #单一链接重连保持时间
protocol TCP
real_server192.168.1.41 80 {
weight 100 #权重
TCP_CHECK { #realserve的状态检测设置部分，单位是秒
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
real_server 192.168.1.42 80 {
weight 100
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
real_server192.168.1.43 80 {
weight 100
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
vrrp_instanceVI_NGINX {
state BACKUP #lvs_backup上将BACKUP改为MASTER
interface ens160 #HA监测网络接口
virtual_router_id 53 #主、备机的virtual_router_id一定要相同，必须相同
priority 80 #lvs_backup上将80改为120
advert_int 1 #VRRPMulticast广播周期秒数
authentication {
auth_type PASS #VRRP认证方式
auth_pass 1111 #VRRP口令字
}
virtual_ipaddress {
192.168.1.18 #LVS虚拟地址
}
}
virtual_server192.168.1.18 80 {
delay_loop 2 #延时等待时间
lb_algo wrr #轮询算法
lb_kind DR #传输模式
persistence_timeout 1 #单一链接重连保持时间
protocol TCP
real_server192.168.1.31 80 {
weight 100 #权重
TCP_CHECK { #realserve的状态检测设置部分，单位是秒
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
real_server 192.168.1.32 80 {
weight 100
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
real_server192.168.1.33 80 {
weight 100
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
3.9 修改系统配置文件
[root@lvs_mastersrc]# vim /etc/sysctl.conf
打开编辑器，修改
net.ipv4.ip_forward= 1
#net.ipv4.conf.default.rp_filter= 1
#net.ipv4.conf.default.accept_source_route = 0
#ernel.sysrq = 0
#kernel.core_uses_pid = 1
保存，退出
运行生效
[root@lvs_mastersrc]# sysctl -p
net.ipv4.ip_forward= 1
3.10.LVS运行测试（主备LVS服务器各出打开三个终端，共6个终端，每个单独运行以下一条命令，用于监测服务运行状态）
一个终端查看日志信息
[root@lvs_mastersrc]# tail -f /var/log/messages
一个终端查看LVS当前设置
[root@lvs_mastersrc]# watch ipvsadm -Ln
一个终端查看转发情况
[root@lvs_mastersrc]# watch ipvsadm -Lnc
3.11.设置自动运行keepalived
[root@lvs_master /]# vim /etc/rc.d/rc.local
打开编辑器，添加以下内容
iptables-F
systemctlstart keepalived
保存，退出
3.12.重启keepalived服务
[root@lvs_master/]# systemctl restart keepalived
信息可以在之前三个终端反映出来
3.13.关闭selinux
[root@lvs_master ~]#vim /etc/selinux/config
打开编辑器，屏蔽以下两行
#SELINUX=enforcing
#SELINUXTYPE=targeted
添加以下一行
SELINUXTYPE=disabled
保存退出
重启后，查询是否关闭（显示Disabled则表示关闭）
[root@lvs_master ~]#shutdown -r now
[root@lvs_master ~]#getenforce
Disabled
配置文件：
master：
[root@node1 keepalived]# cat keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id LVS_MASTER
}
vrrp_instance VI_1 {
state MASTER
#interface eth0
interface eno16777728
virtual_router_id 51
priority 120
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.2.136
}
}
virtual_server 192.168.2.136 80 {
delay_loop 2
lb_algo wrr
lb_kind DR
nat_mask 255.255.255.0
persistence_timeout 1
protocol TCP
real_server 192.168.2.132 80 {
weight 100
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
vrrp_instance VI_2 {
state BACKUP
#interface eth0
interface eno16777728
virtual_router_id 53
priority 80
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.2.135
}
}
virtual_server 192.168.2.135 80 {
delay_loop 2
lb_algo wrr
lb_kind DR
nat_mask 255.255.255.0
persistence_timeout 1
protocol TCP
real_server 192.168.2.133 80 {
weight 100
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
backup：
[root@node2 keepalived]# cat keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id LVS_BACKUP
}
vrrp_instance VI_1 {
state BACKUP
#interface eth0
interface eno16777728
virtual_router_id 51
priority 80
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.2.136
}
}
virtual_server 192.168.2.136 80 {
delay_loop 2
lb_algo wrr
lb_kind DR
nat_mask 255.255.255.0
persistence_timeout 1
protocol TCP
real_server 192.168.2.132 80 {
weight 100
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
vrrp_instance VI_2 {
state MASTER
#interface eth0
interface eno16777728
virtual_router_id 53
priority 120
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.2.135
}
}
virtual_server 192.168.2.135 80 {
delay_loop 2
lb_algo wrr
lb_kind DR
nat_mask 255.255.255.0
persistence_timeout 1
protocol TCP
real_server 192.168.2.133 80 {
weight 100
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
realserver-1
[root@node3 sbin]# cat lvs_realserver.sh
#!/bin/bash
VIP=192.168.2.136
/etc/rc.d/init.d/functions
case "$1" in
start)
ifconfig lo:0 $VIP netmask 255.255.255.255 broadcast $VIP
/sbin/route add -host $VIP dev lo:0
echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
sysctl -p >/dev/null 2>&1
echo "RealServer Start OK"
;;
stop)
ifconfig lo:0 down
route del $VIP >/dev/null 2>&1
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
echo "RealServer Stoped"
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
esac
exit 0
realserver-2
[root@node4 sbin]# cat lvs_realserver.sh
#!/bin/bash
VIP=192.168.2.135
/etc/rc.d/init.d/functions
case "$1" in
start)
ifconfig lo:0 $VIP netmask 255.255.255.255 broadcast $VIP
/sbin/route add -host $VIP dev lo:0
echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
sysctl -p >/dev/null 2>&1
echo "RealServer Start OK"
;;
stop)
ifconfig lo:0 down
route del $VIP >/dev/null 2>&1
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
echo "RealServer Stoped"
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
esac
exit 0
