Information of leap second insertion in Enterprise Cloud 2.0 on December 31, 2016. [12/20/2016 Update]
- Update “Cent OS, Red Hat Enterprise Linux on Baremetal Server”
- Update “Ubuntu on Baremetal Server and Virtual Server”
- Update “Core OS on Baremetal Server”
The leap second will be inserted between 23:59:59 31st, December 2016 and 0:00:00 1st, January 2017 in UTC. The leap second is a one-second adjustment that’s occasionally applied to Coordinated Universal Time (UTC) in order to keep its time of day close to the mean solar time, or UT1. Our NTP server provided via Common Function Gateway will insert Leap Indicator as well. In order to minimize the impact by leap second, we hereby show how to configure slew mode in OS provided as Enterprise Cloud 2.0 Official Image Templates.
NOTE: We have confirmed that Load Balancer(NetScaler VPX), Firewall (Brocade 5600 vRouter) and Enterprise Cloud 2.0 service infrastructure would not be affected by leap second.
# Please contact to application provider for details regarding application configuration against leap second.
# Below information is for the customers who are using official image template with default settings provided in Enterprise Cloud.
Information for Leap second insertion
・CentOS, Red Hat Enterprise Linux on Baremetal Server menu
In default setting, ntpd is used for time synchronization. Please follow the instructions below to upgrade the latest package and configure slew mode.
1.Update ntpd package by yum
2.Add “-x” in /etc/sysconfig/ntpd to configure.
(ex.) OPTIONS=”-g -x”
3.Execute “systemctl restart ntpd” to restart ntpd.
・CentOS、 Oracle Linux, Red Hat Enterprise Linux, Red Hat Enterprise Linux for SAP applications on Virtual Server menu
In default setting, chrony is used for time synchronization. Please follow the instructions below to upgrade the latest package and configure slew mode.
1.Update chrony package by yum
2.Add “leapsecmode slew” in /etc/chrony.conf to configure.
3.Execute “systemctl restart chronyd” to restart chrony.
・Red Hat Enterprise Linux for SAP HANA on Baremetal Server menu
In default setting, ntpd with STEP mode is used for time synchronization. To avoid impact of leap second, please change configuration to slew mode by following instructions.
1.Add -x option in /etc/sysconfig/ntpd
(ex.)OPTIONS=”-x –u ntp:ntp -p /var/run/ntpd.pid -g”
・Ubuntu on Baremetal Server or Virtual Server menu
1.Download package named ntp_4.2.8 from Launchpad. NTP package can be downloaded from this URL.
2.Update NTP by using downloaded one.
3.Add -x option in /etc/default/ntp
(ex.) NTPD_OPS=’-g -x’
4.Execute “/etc/init.d/ntp restart” command to restart ntpd
・CoreOS on Baremetal Server menu
Configure slew mode via cloud-init
・Windows Server on Baremetal Server or Virtual Server menu
Microsoft has announced that the leap second has no effect on Windows Server and SQL server operations. Windows Server and SQL Server provided as our Official Image Template will not be affected by leap second as well. Please refer to following URL for Microsoft announcement.
・vSphere ESXi on Baremetal Server menu
VMWare has announced that ESXi will not be impacted by leap seconds. Please refer to following URL:
Please refer to following URL for how to configure slew mode.
This notification is described based on information provided by each Software provider and our testing results. This is not guaranteed to run in all environments. Therefore, please make sure everything works fine after configuration change on customer’s side.