昨天在作服務器磁盤分區擴容的時候出現過一個服務啓動的問題，在此記錄。
情景再現：前天晚上申請作磁盤擴容，獲得批准後，昨天早上5點開始作停機調整維護，歷經2個多小時的折騰，擴充完畢，有關這部份內容請參考上篇博文 （ https://blog.51cto.com/hld1992/2054837） 然後重啓機器，檢查服務，nginx，php-fpm，redis，svn，nfs（？）都啓動正常。而後，去另外一臺機器上掛載nfs，問題出現了，nfs無響應。回來檢查nfs服務:
好嘛，rpcbind服務沒有啓動，趕忙啓動服務。php
[root@BZ ~]# systemctl start rpcbind A dependency job for rpcbind.service failed. See 'journalctl -xe' for details.
報錯了，根據提示使用journalctl -xe看一下日誌：css
[root@BZ ~]# journalctl -xe -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit session-3.scope has begun starting up. Dec 26 21:34:26 BZ chronyd[490]: System clock wrong by -1.090838 seconds, adjustment started Dec 26 21:35:31 BZ chronyd[490]: Selected source 61.216.153.107 Dec 26 21:35:31 BZ chronyd[490]: System clock wrong by 0.646329 seconds, adjustment started Dec 26 21:36:24 BZ polkitd[484]: Registered Authentication Agent for unix-process:2701:32282 (system bus name :1.29 [/usr/bin/pkttyagent --notify-fd 5 --fallback], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8) Dec 26 21:36:24 BZ systemd[1]: rpcbind.socket failed to listen on sockets: Address family not supported by protocol #報錯顯示ip地址協議不支持 Dec 26 21:36:24 BZ systemd[1]: Failed to listen on RPCbind Server Activation Socket. #端口監聽失敗 -- Subject: Unit rpcbind.socket has failed -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit rpcbind.socket has failed. -- -- The result is failed. Dec 26 21:36:24 BZ systemd[1]: Dependency failed for RPC bind service.
因而趕忙谷歌了下，發現是因爲ipv6被禁用致使的。查看下/etc/sysctl.confnginx
[root@BZ ~]# less /etc/sysctl.conf | grep 'net.ipv6' net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 net.ipv6.conf.lo.disable_ipv6 = 1
果真ipv6被禁用了。因爲當時狀況緊急，我採起了一個比較很差的方法，把ipv6啓用了（後面還有其餘方法介紹）。redis
[root@BZ ~]# sed -i 's@net.ipv6.conf.all.disable_ipv6 = 1@net.ipv6.conf.all.disable_ipv6 = 0@g' /etc/sysctl.conf [root@BZ ~]# sysctl -p ... net.ipv6.conf.all.disable_ipv6 = 0
再次啓動rpcbindruby
[root@BZ ~]# systemctl start rpcbind [root@BZ ~]# systemctl status rpcbind ● rpcbind.service - RPC bind service Loaded: loaded (/usr/lib/systemd/system/rpcbind.service; indirect; vendor preset: enabled) Active: active (running) since Tue 2017-12-26 21:48:22 EST; 7s ago Process: 2734 ExecStart=/sbin/rpcbind -w $RPCBIND_ARGS (code=exited, status=0/SUCCESS) Main PID: 2735 (rpcbind) CGroup: /system.slice/rpcbind.service └─2735 /sbin/rpcbind -w Dec 26 21:48:22 BZ systemd[1]: Starting RPC bind service... Dec 26 21:48:22 BZ systemd[1]: Started RPC bind service.
啓動成功。再啓動nfs服務器
[root@BZ ~]# systemctl start nfs [root@BZ ~]# systemctl status nfs ● nfs-server.service - NFS server and services Loaded: loaded (/usr/lib/systemd/system/nfs-server.service; disabled; vendor preset: disabled) Active: active (exited) since Tue 2017-12-26 21:50:05 EST; 996ms ago Process: 2761 ExecStart=/usr/sbin/rpc.nfsd $RPCNFSDARGS (code=exited, status=0/SUCCESS) Process: 2756 ExecStartPre=/bin/sh -c /bin/kill -HUP `cat /run/gssproxy.pid` (code=exited, status=0/SUCCESS) Process: 2755 ExecStartPre=/usr/sbin/exportfs -r (code=exited, status=0/SUCCESS) Main PID: 2761 (code=exited, status=0/SUCCESS) CGroup: /system.slice/nfs-server.service Dec 26 21:50:05 BZ systemd[1]: Starting NFS server and services... Dec 26 21:50:05 BZ systemd[1]: Started NFS server and services.
再次去客戶端掛載nfs就能夠成功了。session
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剛纔說了，啓動ipv6固然不是一個好的方法，下面來繼續說明下。
從前面的報錯日誌中咱們能夠看到，rpcbind.service依賴rpcbind.socketless
-- Unit rpcbind.socket has failed.
既然rpcbind.socket啓動失敗，那應該在它的配置文件中會有關於ipv6的配置，我來找一下：socket
[root@BZ ~]# find /etc/ -name '*rpcbind.socket*' /etc/systemd/system/sockets.target.wants/rpcbind.socket
進去看下：ide
[Unit] Description=RPCbind Server Activation Socket [Socket] ListenStream=/var/run/rpcbind.sock ListenStream=[::]:111 #果真監聽了ipv6地址，將這一行註釋便可 ListenStream=0.0.0.0:111 BindIPv6Only=ipv6-only [Install] WantedBy=sockets.target
將關於ipv6的相關配置註釋後，重啓rpcbind.socket
[root@BZ ~]# systemctl restart rpcbind.socket Warning: rpcbind.socket changed on disk. Run 'systemctl daemon-reload' to reload units.
systemd發現配置文件有改動，須要重載一下。
[root@BZ ~]# systemctl daemon-reload
再次重啓
[root@BZ ~]# systemctl restart rpcbind.socket [root@BZ ~]# systemctl status rpcbind.socket ● rpcbind.socket - RPCbind Server Activation Socket Loaded: loaded (/usr/lib/systemd/system/rpcbind.socket; enabled; vendor preset: enabled) Active: active (running) since Tue 2017-12-26 22:01:45 EST; 9s ago Listen: /var/run/rpcbind.sock (Stream) 0.0.0.0:111 (Stream) #只監聽了ipv4的111端口
後記
在谷歌的過程當中，發現還有一種方法來解決這個問題。具體就是使用dracut -v -f 命令重建下initramfs，而後重啓機器便可。
還有一個問題就是rpcbind設置開機自啓動失敗
[root@BZ ~]# systemctl enable rpcbind.service [root@BZ ~]# systemctl is-enabled rpcbind.service indirect
不知道是什麼緣由，但願有大神能夠幫我解答啊，萬分感謝，我如今是把它放到了/etc/rc.d/rc.local裏面了。