- 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.
#VERIFICATION- BIONIC
- Before the update iscsi-bionic: ~$ dpkg -l | grep open-iscsi
ubuntu@
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 {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) = 2 201\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]) = 21 201\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
execve("/bin/ping", ["ping", "-c1", "www"], 0x7ffeb4aecd70 /* 14 vars */) = 0
sendmmsg(5, [{msg_hdr=
recvfrom(5, "\300\17\
recvfrom(5, "\0\31\
write(2, "ping: www: Name or service not k"..., 37ping: www: Name or service not known
- After the update iscsi-bionic: ~$ dpkg -l | grep open-iscsi
ubuntu@
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 {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) = 2 201\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]) = 49 201\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
execve("/bin/ping", ["ping", "-c1", "www"], 0x7ffea5cd0390 /* 14 vars */) = 0
sendmmsg(5, [{msg_hdr=
recvfrom(5, "\262\224\
recvfrom(5, "\226\235\
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 ---