问题
1 2019/05/20 15:27:14.574363 ctdb-eventd[26329]: 60.nfs: /etc/ctdb/nfs-linux-kernel-callout: line 143: /proc/sys/net/ipv4/tcp_tw_recycle: No such file or directory
Answer: found out that this option was removed from kernel 4.12 and up
uname -a
Linux suse201 4.12.14-lp150.11-default #1 SMP Fri May 11 08:28:30 UTC 2018 (a9fee09) x86_64 x86_64 x86_64 GNU/Linux
解决方法：
注释掉nfs_startup函数中的这些行。
#_f="${PROCFS_PATH}/sys/net/ipv4/tcp_tw_recycle"
142 #if [ "$_f" ] ; then
143 # echo 1 >"$_f"
144 # fi
2. 2019/05/20 15:21:54.725859 ctdb-eventd[8290]: 60.nfs: service: no such service nfslock
Answer: 修改/etc/ctdb/nfs-linux-kernel-callout中的系统选择，默认为Red Hat， 改为SUSE， 并修改nfs_service="nfs"
nfs_service="nfs"
#nfs_service="nfsserver"
nfslock_service=""
nfs_config="/etc/sysconfig/nfs"
至于为何nfslock_service=""的解释为：nfslock is only needed for NFSv2 and NFSv3. 详见下面链接。
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/storage_administration_guide/s1-nfs-start