Linux myhost 4.1.12-103.7.1.el7uek.x86_64 #(host edited)
Red Hat Enterprise Linux Server release 7.4 (Maipo)
ntpd - NTP daemon program - Ver. 4.2.6p5
ntp-4.2.6p5-25.0.1.el7_3.2.x86_64
/etc/ntp.conf：
driftfile /var/lib/ntp/drift
restrict default nomodify notrap nopeer noquery
restrict 127.0.0.1
restrict ::1
server someserver iburst #edited
server someserver iburst #edited
includefile /etc/ntp/crypto/pw
keys /etc/ntp/keys
disable monitor
ntp 像这样运行，因此没有弃用的 -I 接口选项..：
ntp 25451 0.0 0.0 25676 4156 ? Ss 11:27 0:00 /usr/sbin/ntpd -u ntp:ntp -g
启动时显示：
/usr/sbin/ntpd -n -dd
[...]
Listen and drop on 0 v4wildcard 0.0.0.0 UDP 123
Listen and drop on 1 v6wildcard :: UDP 123
Listen normally on 2 lo 127.0.0.1 UDP 123
Listen normally on 6 vethr9d35e1373f fe80::70f4:4aff:fe83:7639 UDP 123
[...]
并且它还说了这样一行： create_interface(fe80::70f4:4aff:fe83:7639#123)对于每个接口..但不对于::1
/etc/hosts：
::1 localhost localhost.localdomain localhost6
localhost6.localdomain6
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
172.27.30.10 hostname1 hostname2
172.27.30.10 hostname3 hostname4
172.27.30.10 hostname5 hostname6
现在首先在故障服务器上对 ntpq 调用进行以下 strace 操作，然后再在正常运行的服务器上进行操作：
strace ntpq -np |& grep -i conn
connect(3, {sa_family=AF_LOCAL, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
connect(3, {sa_family=AF_LOCAL, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
connect(4, {sa_family=AF_LOCAL, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
connect(3, {sa_family=AF_LOCAL, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
connect(3, {sa_family=AF_INET6, sin6_port=htons(123), inet_pton(AF_INET6, "::1", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, 28) = 0
connect(3, {sa_family=AF_UNSPEC, sa_data="\0\0\0\0\0\0\0\0\0\0\0\0\0\0"}, 16) = 0
connect(3, {sa_family=AF_INET, sin_port=htons(123), sin_addr=inet_addr("127.0.0.1")}, 16) = 0
connect(3, {sa_family=AF_INET6, sin6_port=htons(123), inet_pton(AF_INET6, "::1", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, 28) = 0
并且 ntpq -pn 不起作用：
ntpq -pn
::1: timed out, nothing received
***Request timed out
在类似的服务器上，具有相同的 /etc/hosts，相同的 /etc/ntp.conf 和相同的 kernel/os/ntp 版本create_interface(::1#123)- 但不在我的服务器上。任何指针/尝试的东西都非常感谢。
strace ntpq -np |& grep -i conn
connect(3, {sa_family=AF_LOCAL, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
connect(3, {sa_family=AF_LOCAL, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
connect(4, {sa_family=AF_LOCAL, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
connect(3, {sa_family=AF_LOCAL, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
connect(3, {sa_family=AF_INET, sin_port=htons(123), sin_addr=inet_addr("127.0.0.1")}, 16) = 0
connect(3, {sa_family=AF_INET6, sin6_port=htons(123), inet_pton(AF_INET6, "::1", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, 28) = 0
connect(3, {sa_family=AF_INET6, sin6_port=htons(123), inet_pton(AF_INET6, "::1", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, 28) = 0
connect(4, {sa_family=AF_INET, sin_port=htons(123), sin_addr=inet_addr("127.0.0.1")}, 16) = 0
connect(4, {sa_family=AF_INET6, sin6_port=htons(123), inet_pton(AF_INET6, "::1", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, 28) = 0
并且 ntpq -pn 有效
答案1
对于 ntp-4.2.6p5 及更高版本，尝试将restrict 127.0.0.1或更改restrict 127.0.0.1 mask ...为restrict localhost。