#VERIFICATION-BIONIC

- Before the update
ubuntu@iscsi-bionic:~$ dpkg -l | grep open-iscsi
ii  open-iscsi                            2.0.874-5ubuntu2.2                
amd64        iSCSI initiator tools

ubuntu@iscsi-bionic:~$ cat /etc/resolv.conf 
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
# 127.0.0.53 is the systemd-resolved stub resolver.
# run "systemd-resolve --status" to see details about the actual nameservers.

nameserver 192.168.122.1
domainsearch example.com

ubuntu@iscsi-bionic:~$ sudo strace ping -c1 www 2>&1 | grep www
execve("/bin/ping", ["ping", "-c1", "www"], 0x7ffeb4aecd70 /* 14 vars */) = 0
sendmmsg(5, [{msg_hdr={msg_name=NULL, msg_namelen=0, 
msg_iov=[{iov_base="\300\17\1\0\0\1\0\0\0\0\0\0\3www\0\0\1\0\1", iov_len=21}], 
msg_iovlen=1, msg_controllen=0, 
msg_flags=MSG_TRUNC|MSG_DONTWAIT|MSG_EOR|MSG_WAITALL|MSG_CONFIRM|MSG_RST|MSG_MORE|MSG_BATCH|MSG_ZEROCOPY|MSG_FASTOPEN|0xb420000},
 msg_len=21}, {msg_hdr={msg_name=NULL, msg_namelen=0, 
msg_iov=[{iov_base="\0\31\1\0\0\1\0\0\0\0\0\0\3www\0\0\34\0\1", iov_len=21}], 
msg_iovlen=1, msg_controllen=0, 
msg_flags=MSG_CTRUNC|MSG_FIN|MSG_SYN|MSG_CONFIRM|MSG_RST|MSG_MORE|MSG_BATCH|MSG_ZEROCOPY|MSG_FASTOPEN|0xb420010},
 msg_len=21}], 2, MSG_NOSIGNAL) = 2 
recvfrom(5, "\300\17\201\203\0\1\0\0\0\0\0\0\3www\0\0\1\0\1", 2048, 0, 
{sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("192.168.122.1")}, 
[28->16]) = 21
recvfrom(5, 
"\0\31\201\203\0\1\0\0\0\1\0\0\3www\0\0\34\0\1\0\0\6\0\1\0\0\"L\0@"..., 65536, 
0, {sa_family=AF_INET, sin_port=htons(53), 
sin_addr=inet_addr("192.168.122.1")}, [28->16]) = 96
write(2, "ping: www: Name or service not k"..., 37ping: www: Name or service 
not known

- After the update
ubuntu@iscsi-bionic:~$ dpkg -l | grep open-iscsi
ii  open-iscsi                            2.0.874-5ubuntu2.3                
amd64        iSCSI initiator tools

ubuntu@iscsi-bionic:~$ cat /etc/resolv.conf 
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
# 127.0.0.53 is the systemd-resolved stub resolver.
# run "systemd-resolve --status" to see details about the actual nameservers.

nameserver 192.168.122.1
search example.com

ubuntu@iscsi-bionic:~$ sudo strace ping -c1 www 2>&1 | grep www
execve("/bin/ping", ["ping", "-c1", "www"], 0x7ffea5cd0390 /* 14 vars */) = 0
sendmmsg(5, [{msg_hdr={msg_name=NULL, msg_namelen=0, 
msg_iov=[{iov_base="\262\224\1\0\0\1\0\0\0\0\0\0\3www\7example\3com\0\0\1\0"...,
 iov_len=33}], msg_iovlen=1, msg_controllen=0, 
msg_flags=MSG_TRUNC|MSG_DONTWAIT|MSG_EOR|MSG_WAITALL|MSG_CONFIRM|MSG_ERRQUEUE|MSG_NOSIGNAL|MSG_MORE|MSG_BATCH|MSG_ZEROCOPY|MSG_CMSG_CLOEXEC|0x1b480000},
 msg_len=33}, {msg_hdr={msg_name=NULL, msg_namelen=0, 
msg_iov=[{iov_base="\226\235\1\0\0\1\0\0\0\0\0\0\3www\7example\3com\0\0\34\0"...,
 iov_len=33}], msg_iovlen=1, msg_controllen=0, 
msg_flags=MSG_CTRUNC|MSG_FIN|MSG_SYN|MSG_CONFIRM|MSG_ERRQUEUE|MSG_NOSIGNAL|MSG_MORE|MSG_BATCH|MSG_ZEROCOPY|MSG_CMSG_CLOEXEC|0x1b480010},
 msg_len=33}], 2, MSG_NOSIGNAL) = 2
recvfrom(5, "\262\224\201\200\0\1\0\1\0\0\0\0\3www\7example\3com\0\0\1\0"..., 
2048, 0, {sa_family=AF_INET, sin_port=htons(53), 
sin_addr=inet_addr("192.168.122.1")}, [28->16]) = 49
recvfrom(5, "\226\235\201\200\0\1\0\1\0\2\0\4\3www\7example\3com\0\0\34\0"..., 
65536, 0, {sa_family=AF_INET, sin_port=htons(53), 
sin_addr=inet_addr("192.168.122.1")}, [28->16]) = 197
write(1, "PING www.example.com (93.184.216"..., 132PING www.example.com 
(93.184.216.34) 56(84) bytes of data.
write(1, "--- www.example.com ping statist"..., 114--- www.example.com ping 
statistics ---

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https://bugs.launchpad.net/bugs/1791108

Title:
  open-iscsi uses domainsearch instead of search for /etc/resolv.conf

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