Hi again.
I have these tricky things showing up all the time :)
I have looked here and there but I don't find the answer to this question:
/etc/udev/rules.d contains rules, but as they have persistent in the name I get
suspicious.
and I don't fully understand how these rules are used and when
When a RHEL6 starts and activates the network adapter, does it know if it is
layer 2 or 3 and
is that info used to update /etc/sysconfig/network-scripts/ifcfg-eth0 ?
It currently looks like this in a test server:
DEVICE="eth0"
BOOTPROTO="static"
DNS1="131.97.124.5"
DNS2="131.97.125.24"
DOMAIN="xxx.volvo.testnet"
GATEWAY="10.220.140.1"
IPADDR="10.220.140.2"
NETMASK="255.255.254.0"
NETTYPE="qeth"
NM_CONTROLLED="yes"
ONBOOT="yes"
OPTIONS="layer2=0"
SUBCHANNELS="0.0.0700,0.0.0701,0.0.0702"
TYPE="Ethernet"
Maybe we will switch to layer 2 later, and if so we want the servers to
automagically configure itself.
Sofar it seems it does not, so the following script will be used at boot time (
/etc/rc.local ).
But after coding it I realized it might not be needed, or it might be... :)
As you see I have some extra exits still. Safetynet.
# Get the LAYER used from the z/VM system. Layer 2 = Ethernet with MAC-address,
Layer 3 = IP-only
LAYER2='0'
vmcp q vswitch anytype > /root/temp_quewry_vswitch.txt
# set linenr to 0, we want to peek into line 2
linenr=`expr 1`
while read line
do
if [ $linenr = "2" ]; then
echo "linenr 2:"$line
found_it=`echo $line | grep "Ethernet"`
if [ "$found_it" = "" ]; then
echo "Ethernet NOT found from VMCP QUERY VSWITCH ANYTYPE, this is LAYER
3, IP-only"
LAYER2='0'
else
echo "Ethernet FOUND from VMCP QUERY VSWITCH ANYTYPE, this is LAYER 2,
with MAC address"
LAYER2='1'
fi
fi
linenr=`expr $linenr + 1`
done < /root/temp_quewry_vswitch.txt
echo 'DEVICE="eth0"' > /root/temp-ifcfg
echo 'BOOTPROTO="static"' >> /root/temp-ifcfg
echo 'DNS1="'$DNS1'"' >> /root/temp-ifcfg
echo 'DNS2="'$DNS2'"' >> /root/temp-ifcfg
echo 'DOMAIN="'$DOMAIN'"' >> /root/temp-ifcfg
echo 'GATEWAY="'$GATEWAY'"' >> /root/temp-ifcfg
echo 'IPADDR="'$IP'"' >> /root/temp-ifcfg
echo 'NETMASK="'$NETMASK'"' >> /root/temp-ifcfg
echo 'NETTYPE="qeth"' >> /root/temp-ifcfg
echo 'NM_CONTROLLED="yes"' >> /root/temp-ifcfg
echo 'ONBOOT="yes"' >> /root/temp-ifcfg
echo 'OPTIONS="layer2='$LAYER2'"' >> /root/temp-ifcfg
echo 'SUBCHANNELS="0.0.0700,0.0.0701,0.0.0702"' >> /root/temp-ifcfg
echo 'TYPE="Ethernet"' >> /root/temp-ifcfg
diff_output=`diff -q /root/temp-ifcfg /etc/sysconfig/network-scripts/ifcfg-eth0`
echo "diff_output="$diff_output
if [ "$diff_output" = "" ]; then
log_info 'IPconfig same as before, no change and no network restart.'
exit 0 #
else
log_info 'IPconfig is changed.'
exit 0 #
cp /root/temp-ifcfg /etc/sysconfig/network-scripts/ifcfg-eth0
log_info 'Created a new /etc/sysconfig/network-scripts/ifcfg-eth0 , will
restart the network now.'
service network restart
fi
Cordialement / Vriendelijke Groeten / Best Regards / Med Vänliga Hälsningar
Tore Agblad
________________________________________________
Tore Agblad
System programmer, Volvo IT certified IT Architect
Volvo Information Technology
Infrastructure Mainframe Design & Development, Linux servers
Dept 4352 DA1S
SE-405 08, Gothenburg Sweden
Telephone: +46-31-3233569
E-mail: [email protected]
http://www.volvo.com/volvoit/global/en-gb/
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