service nsd status
nscd dead but subsys locked
一开始一切正常，但最终崩溃了......
server:
logfile: "/var/log/nsd.log"
pidfile: "/var/run/nsd/nsd.pid"
什么原因导致 NSD 随机发生这种情况？
日志：
[1354003784] nsd[403807]: notice: nsd started (NSD 3.2.13), pid 403807
[1354003804] nsd[403810]: info: NSTATS 1354003804 1354003784 A=33 TXT=1 AAAA=7
[1354003804] nsd[403810]: info: XSTATS 1354003804 1354003784 RR=0 RNXD=0 RFwdR=0 RDupR=0 RFail=0 RFErr=0 RErr=0 RAXFR=0 RLame=0 ROpts=0 SSysQ=0 SAns=41 SFwdQ=0 SDupQ=0 SErr=0 RQ=41 RIQ=0 RFwdQ=0 RDupQ=0 RTCP=0 SFwdR=0 SFail=2 SFErr=0 SNaAns=0 SNXD=2 RUQ=0 RURQ=0 RUXFR=0 RUUpd=0
[1354003888] nsd[404385]: error: ...stale pid file from process 403807
[1354003888] nsd[404386]: notice: nsd started (NSD 3.2.13), pid 404386
[1354004044] nsd[404389]: info: NSTATS 1354004044 1354003888 A=310 NS=1 MX=20 TXT=4 AAAA=83 TYPE255=1
[1354004044] nsd[404389]: info: XSTATS 1354004044 1354003888 RR=0 RNXD=0 RFwdR=0 RDupR=0 RFail=0 RFErr=0 RErr=0 RAXFR=0 RLame=0 ROpts=0 SSysQ=0 SAns=419 SFwdQ=0 SDupQ=0 SErr=0 RQ=419 RIQ=0 RFwdQ=0 RDupQ=0 RTCP=0 SFwdR=0 SFail=107 SFErr=0 SNaAns=0 SNXD=7 RUQ=0 RURQ=0 RUXFR=0 RUUpd=0
[1354004063] nsd[405235]: error: ...stale pid file from process 404386
[1354004063] nsd[405238]: notice: nsd started (NSD 3.2.13), pid 405238
[1354004284] nsd[405243]: info: NSTATS 1354004284 1354004063 A=359 NS=1 MX=21 TXT=4 AAAA=64
[1354004284] nsd[405243]: info: XSTATS 1354004284 1354004063 RR=0 RNXD=0 RFwdR=0 RDupR=0 RFail=0 RFErr=0 RErr=0 RAXFR=0 RLame=0 ROpts=0 SSysQ=0 SAns=449 SFwdQ=0 SDupQ=0 SErr=0 RQ=449 RIQ=0 RFwdQ=0 RDupQ=0 RTCP=0 SFwdR=0 SFail=59 SFErr=0 SNaAns=0 SNXD=11 RUQ=0 RURQ=0 RUXFR=0 RUUpd=0
[1354004365] nsd[406999]: error: ...stale pid file from process 405238
[1354004365] nsd[407000]: notice: nsd started (NSD 3.2.13), pid 407000
[1354004529] nsd[407005]: info: NSTATS 1354004529 1354004365 A=253 NS=2 CNAME=1 MX=65 TXT=3 AAAA=56 TYPE38=6 SPF=1 TYPE255=2
[1354004529] nsd[407005]: info: XSTATS 1354004529 1354004365 RR=0 RNXD=0 RFwdR=0 RDupR=0 RFail=0 RFErr=0 RErr=0 RAXFR=0 RLame=0 ROpts=0 SSysQ=0 SAns=389 SFwdQ=0 SDupQ=0 SErr=0 RQ=389 RIQ=0 RFwdQ=0 RDupQ=0 RTCP=0 SFwdR=0 SFail=82 SFErr=0 SNaAns=0 SNXD=7 RUQ=0 RURQ=0 RUXFR=0 RUUpd=0
[1354004665] nsd[412757]: error: ...stale pid file from process 407000
[1354004665] nsd[412758]: notice: nsd started (NSD 3.2.13), pid 412758
[1354004764] nsd[412767]: info: NSTATS 1354004764 1354004665 A=248 MX=14 TXT=3 AAAA=21
[1354004764] nsd[412767]: info: XSTATS 1354004764 1354004665 RR=0 RNXD=0 RFwdR=0 RDupR=0 RFail=0 RFErr=0 RErr=0 RAXFR=0 RLame=0 ROpts=0 SSysQ=0 SAns=286 SFwdQ=0 SDupQ=0 SErr=0 RQ=286 RIQ=0 RFwdQ=0 RDupQ=0 RTCP=0 SFwdR=0 SFail=43 SFErr=0 SNaAns=0 SNXD=4 RUQ=0 RURQ=0 RUXFR=0 RUUpd=0
[1354004860] nsd[413561]: error: ...stale pid file from process 412758
[1354004860] nsd[413562]: notice: nsd started (NSD 3.2.13), pid 413562
答案1
centos 6 使用的是 2.6.32。在 centos 6 上，不再推荐使用 nscd。所有身份验证都通过 SSSD 完成，包括缓存。对于主机名缓存，最好使用 dnsmasq 之类的东西。