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[interfaces] Reduce Calls to SONiC Cfggen (#5174)

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Calls to sonic-cfggen is CPU expensive. This PR reduces calls to
sonic-cfggen to one call during startup when running interfaces-
config.

singed-off-by: Tamer Ahmed <tamer.ahmed@microsoft.com>
This commit is contained in:
Tamer Ahmed 2020-08-17 15:46:52 -07:00 committed by Abhishek Dosi
parent 066a0b3b2b
commit b5bf5e3bce
1 changed files with 8 additions and 4 deletions
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12
files/image_config/interfaces/interfaces-config.sh
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@ -18,8 +18,14 @@ else
echo "{ \"ZTP_DHCP_DISABLED\" : \"true\" }" > /tmp/ztp_input.json
fi
# Create /e/n/i file for existing and active interfaces
sonic-cfggen -d -j /tmp/ztp_input.json -t /usr/share/sonic/templates/interfaces.j2 > /etc/network/interfaces
# Create /e/n/i file for existing and active interfaces, dhcp6 sytcl.conf and dhclient.conf
CFGGEN_PARAMS=" \
-d -j /tmp/ztp_input.json \
-t /usr/share/sonic/templates/interfaces.j2,/etc/network/interfaces \
-t /usr/share/sonic/templates/90-dhcp6-systcl.conf.j2,/etc/sysctl.d/90-dhcp6-systcl.conf \
-t /usr/share/sonic/templates/dhclient.conf.j2,/etc/dhcp/dhclient.conf \
"
sonic-cfggen $CFGGEN_PARAMS
[ -f /var/run/dhclient.eth0.pid ] && kill `cat /var/run/dhclient.eth0.pid` && rm -f /var/run/dhclient.eth0.pid
[ -f /var/run/dhclient6.eth0.pid ] && kill `cat /var/run/dhclient6.eth0.pid` && rm -f /var/run/dhclient6.eth0.pid
@ -28,11 +34,9 @@ for intf_pid in $(ls -1 /var/run/dhclient*.Ethernet*.pid 2> /dev/null); do
[ -f ${intf_pid} ] && kill `cat ${intf_pid}` && rm -f ${intf_pid}
done
sonic-cfggen -d -j /tmp/ztp_input.json -t /usr/share/sonic/templates/90-dhcp6-systcl.conf.j2 > /etc/sysctl.d/90-dhcp6-systcl.conf
# Read sysctl conf files again
sysctl -p /etc/sysctl.d/90-dhcp6-systcl.conf
sonic-cfggen -d -j /tmp/ztp_input.json -t /usr/share/sonic/templates/dhclient.conf.j2 > /etc/dhcp/dhclient.conf
systemctl restart networking
# Clean-up created files