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#!/bin/sh
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# $Id: rc.vdenetwork,v 1.7 2011/12/06 14:18:08 root Exp root $
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# Qemu environment preparation script
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#=========================== EDIT THE FOLLOWING VARIABLES ==========================
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# _________________________________________________________________________________
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# | |
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# | Interface name to use for the TAP device |
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# | |
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TAP_IF="tap0"
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# |_________________________________________________________________________________|
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# | |
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# | IP Address/Subnet in CIDR Notation for the Virtual Network |
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# | |
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TAP_NET="10.10.10.1/24"
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# |_________________________________________________________________________________|
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# ---------------------------------------------------------------------------
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#
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#=========================== DO NOT EDIT BELOW THIS LINE ============================
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start(){
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echo -n "Starting VDE Switch..."
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# Load tun module
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modprobe tun || { echo "Error, cannot load 'tun' module. Exiting..." ; exit 1 ; }
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sleep 1
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# Start tap switch
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vde_switch -tap ${TAP_IF} -daemon || { echo "Error, cannot assign IP to ${TAP_IF}. Exiting..." ; exit 1 ; }
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# Bring tap interface up
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ip addr add ${TAP_NET} dev ${TAP_IF}
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ip link set ${TAP_IF} up
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#chmod 666 /tmp/vde.ctl
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chmod -R a+rwx /var/run/vde.ctl
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# Apply workaround
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echo 1024 > /proc/sys/dev/rtc/max-user-freq
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echo
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# After running this startup script, run a QEMU virtual machine in this way:
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#
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# qemu-system-x86_64 \
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# -net vde,sock=/var/run/kvm0.ctl,vlan=0 -net nic,vlan=0 \
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# [qemu_option [qemu_option], ...]
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#
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# This will automatically connect the QEMU virtual machine to the VDE switch.
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#
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# ---------------------------------------------------------------------------
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#
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# Network type can be one of "route" "bridge" or "nat":
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# - In "route" mode, the script will expect that the 'routed' daemon is running
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# on the host (see /etc/rc.d/rc.inet2 to start 'routed'), and will not
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# create iptables NAT rules.
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# The virtual network will be routed on the LAN and will be accessible as a
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# separate network segment (make sure the IP range defined below does not
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# conflict with existing parts of your network!). The guests will use our
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# private dnsmasq server to obtain IP addresses.
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# - In "bridge" mode, the script will try to add the tap device to an existing
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# network bridge, and will not create iptables NAT rules.
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# The guests will be seen on the LAN as part of the network.
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# - In "nat" mode, the script will create iptables NAT rules. These hide the
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# virtual network behind an internal NAT router. The guests will have full
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# network access, but will be accessible only from the host.
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#
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# ---------------------------------------------------------------------------
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#NETWORKTYPE="route"
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#NETWORKTYPE="bridge"
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NETWORKTYPE="nat"
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# Host interfaces that need to be NAT-ed (in case we're not bridging/routing):
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# Add more interfaces space-separated, like "eth+ wlan+"
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NAT_IFS="eth+"
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# What is the bridge interface called if we are bridging?
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BR_DEV=br0
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# What is the name of the tun/tap device we will be using?
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TAP_DEV=kvm0
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start_tap() {
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# Load tun module
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/sbin/modprobe tun 2>/dev/null
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# Wait for the module to be loaded
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while ! /bin/lsmod |grep -q "^tun"; do echo Waiting for tun device;sleep 1; done
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# Start tap switch
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vde_switch --tap ${TAP_DEV} --daemon --group kvm \
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--sock /var/run/${TAP_DEV}.ctl --pidfile /var/run/${TAP_DEV}_vde.pid \
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--mod 775 --mgmtmode 770 --mgmt /var/run/${TAP_DEV}-manage
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sleep 1
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# Change pipe permission:
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#chmod -R a+rwx /var/run/vde.ctl
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} # End start_tap
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stop_tap() {
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# Bring tap interface down:
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ifconfig ${TAP_DEV} down
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# Kill VDE switch:
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#pgrep -f vde_switch | xargs kill -TERM
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kill -HUP $(cat /var/run/${TAP_DEV}_vde.pid)
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# Remove the control socket:
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#rmdir /var/run/vde.ctl
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} # End stop_tap
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start_localdhcp() {
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# The IP configuration for the tap device that will be used for
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# the virtual machine network:
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TAP_IP=10.111.111.254
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TAP_MASK=255.255.255.0
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TAP_BCAST=$(/bin/ipmask ${TAP_MASK} ${TAP_IP} | cut -f 1 -d ' ')
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# Definitions for the LAN segment the Qemu virtual machines will be in.
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# These definitions will be fed to dnsmasq - this program will provide DNS
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# and DHCP to the Qemu LAN.
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|
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# The VM_IPLOW and VM_IPHIGH addresses must agree with the definitions for
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# the tap0 device above. These 'low' and 'high' values are the IP address
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# range for the DHCP server to use.
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VM_DOMAIN=qemu.lan
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VM_IPLOW=10.111.111.128
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VM_IPHIGH=10.111.111.199
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VM_BCAST=${TAP_BCAST}
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VM_MASK=${TAP_MASK}
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# For additional options to dnsmasq - the commented example specifies that
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# all DNS lookups for 'my.net' should go to 192.168.1.1;
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# On the second line you find a configuration for supporting network boot:
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#DNSMASQ_OPTIONS="--server /my.net/192.168.1.1 \
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# --dhcp-boot=/pxelinux.0,\"192.168.1.1\",192.168.1.1"
|
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DNSMASQ_OPTIONS=""
|
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|
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# Bring tap interface up
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ifconfig ${TAP_DEV} ${TAP_IP} broadcast ${TAP_BCAST} netmask ${TAP_MASK}
|
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|
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# Start dnsmasq, the DNS/DHCP server
|
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# for our Virtual Machines behind the tap0 interface.
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# The '--conf-file' option prevents this instance from reading the default
|
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# /etc/dnsmasq.conf settings. Also, binds to the tun interface, to keep it
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# from interfering with other dnsmasq/named processes running on the host's
|
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# primary interfaces.
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/usr/sbin/dnsmasq \
|
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--log-queries \
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--user=daemon \
|
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--dhcp-leasefile=/var/state/dhcp/qemu-dhcpd.leases \
|
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--dhcp-range=${VM_IPLOW},${VM_IPHIGH},${VM_MASK},${VM_BCAST},8h \
|
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--interface=${TAP_DEV} --except-interface=lo --bind-interfaces \
|
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--pid-file=/var/run/${TAP_DEV}_dnsmasq.pid --conf-file \
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--domain=${VM_DOMAIN} \
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$DNSMASQ_OPTIONS
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} # End start_localdhcp
|
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stop_localdhcp() {
|
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# Stop dnsmasq
|
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#pgrep -f dnsmasq | xargs kill -TERM
|
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kill -TERM $(cat /var/run/${TAP_DEV}_dnsmasq.pid) \
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&& rm -f /var/run/${TAP_DEV}_dnsmasq.pid
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} # End stop_localdhcp
|
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|
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start_route() {
|
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# We need a private dnsmasq instance in a routed configuration:
|
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start_localdhcp
|
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} # End start_route
|
||||
|
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stop_route() {
|
||||
# We need to stop our private dnsmasq instance in a routed configuration:
|
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stop_localdhcp
|
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} # End stop_route
|
||||
|
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start_nat() {
|
||||
# Start IP Forwarding
|
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echo "1" > /proc/sys/net/ipv4/ip_forward
|
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for NIC in ${NAT_IFS}; do
|
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iptables -t nat -A POSTROUTING -o ${NIC} -j MASQUERADE
|
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done
|
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|
||||
# We need a private dnsmasq instance in a NAT configuration:
|
||||
start_localdhcp
|
||||
|
||||
} # End start_nat
|
||||
|
||||
stop_nat() {
|
||||
# We need to stop our private dnsmasq in a NAT configuration:
|
||||
stop_localdhcp
|
||||
|
||||
# Delete the NAT rules
|
||||
for NIC in ${NAT_IFS}; do
|
||||
iptables -t nat -D POSTROUTING -o ${NIC} -j MASQUERADE
|
||||
done
|
||||
# Stop IP Forwarding
|
||||
echo "0" > /proc/sys/net/ipv4/ip_forward
|
||||
}
|
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|
||||
start_bridge() {
|
||||
# Connect our tap device from the bridge:
|
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/sbin/ifconfig $TAP_DEV down
|
||||
/sbin/ifconfig $TAP_DEV 0.0.0.0 promisc up
|
||||
/sbin/brctl addif $BR_DEV $TAP_DEV
|
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}
|
||||
|
||||
stop(){
|
||||
echo -n "Stopping VDE Switch..."
|
||||
|
||||
# Bring tap interface down
|
||||
ip addr flush dev ${TAP_IF}
|
||||
ip link set ${TAP_IF} down
|
||||
|
||||
# Kill VDE switch
|
||||
kill $(pgrep vde_switch)
|
||||
sleep 1
|
||||
|
||||
# Remove tun module
|
||||
modprobe -r tun
|
||||
echo
|
||||
stop_bridge() {
|
||||
# Disconnect our tap device from the bridge:
|
||||
/sbin/brctl delif $BR_DEV $TAP_DEV
|
||||
}
|
||||
|
||||
# See how we were called.
|
||||
|
||||
case "$1" in
|
||||
start)
|
||||
start
|
||||
;;
|
||||
|
||||
stop)
|
||||
stop
|
||||
;;
|
||||
|
||||
restart)
|
||||
stop
|
||||
start
|
||||
;;
|
||||
*)
|
||||
echo "Usage: $0 {start|stop|restart}"
|
||||
;;
|
||||
start)
|
||||
echo -n "Starting VDE network for QEMU: "
|
||||
|
||||
start_tap
|
||||
start_$NETWORKTYPE
|
||||
echo
|
||||
;;
|
||||
stop)
|
||||
echo -n "Stopping VDE network for QEMU: "
|
||||
stop_$NETWORKTYPE
|
||||
stop_tap
|
||||
echo
|
||||
;;
|
||||
restart|reload)
|
||||
$0 stop
|
||||
sleep 1
|
||||
$0 start
|
||||
;;
|
||||
*)
|
||||
echo "Usage: $0 {start|stop|restart|reload}"
|
||||
exit 1
|
||||
esac
|
||||
|
||||
Loading…
Reference in new issue