运行df -h命令无响应问题解决
1.使用strace查看df日志
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[root@localhost ~]# <strong>strace df -h</strong> execve("/usr/bin/df", ["df", "-h"], [/* 31 vars */]) = 0 brk(NULL) = 0x6c8000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f6c775fb000 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) open("tls/x86_64/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) open("tls/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) open("x86_64/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) open("libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) open("/opt/tomcat/lib/tls/x86_64/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) stat("/opt/tomcat/lib/tls/x86_64", 0x7ffdfbc4dc90) = -1 ENOENT (No such file or directory) open("/opt/tomcat/lib/tls/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) stat("/opt/tomcat/lib/tls", 0x7ffdfbc4dc90) = -1 ENOENT (No such file or directory) open("/opt/tomcat/lib/x86_64/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) stat("/opt/tomcat/lib/x86_64", 0x7ffdfbc4dc90) = -1 ENOENT (No such file or directory) open("/opt/tomcat/lib/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) stat("/opt/tomcat/lib", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0 open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=40892, ...}) = 0 mmap(NULL, 40892, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f6c775f1000 close(3) = 0 open("/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P%\2\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=2173512, ...}) = 0 mmap(NULL, 3981792, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f6c7700e000 mprotect(0x7f6c771d1000, 2093056, PROT_NONE) = 0 mmap(0x7f6c773d0000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1c2000) = 0x7f6c773d0000 mmap(0x7f6c773d6000, 16864, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f6c773d6000 close(3) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f6c775f0000 mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f6c775ee000 arch_prctl(ARCH_SET_FS, 0x7f6c775ee740) = 0 mprotect(0x7f6c773d0000, 16384, PROT_READ) = 0 mprotect(0x616000, 4096, PROT_READ) = 0 mprotect(0x7f6c775fc000, 4096, PROT_READ) = 0 munmap(0x7f6c775f1000, 40892) = 0 brk(NULL) = 0x6c8000 brk(0x6e9000) = 0x6e9000 brk(NULL) = 0x6e9000 open("/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=106070960, ...}) = 0 mmap(NULL, 106070960, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f6c70ae5000 close(3) = 0 open("/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=2502, ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f6c775fa000 read(3, "# Locale name alias data base.\n#"..., 4096) = 2502 read(3, "", 4096) = 0 close(3) = 0 munmap(0x7f6c775fa000, 4096) = 0 open("/usr/share/locale/en_US.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/share/locale/en_US.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/share/locale/en_US/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/share/locale/en.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/share/locale/en.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/share/locale/en/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory) open("/etc/mtab", O_RDONLY|O_CLOEXEC) = 3 fstat(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f6c775fa000 read(3, "rootfs / rootfs rw 0 0\nsysfs /sy"..., 1024) = 1024 read(3, "exec,relatime,devices 0 0\ncgroup"..., 1024) = 1024 read(3, ",mode=700 0 0\nbinfmt_misc /proc/"..., 1024) = 285 read(3, "", 1024) = 0 close(3) = 0 munmap(0x7f6c775fa000, 4096) = 0 stat("/", {st_mode=S_IFDIR|0555, st_size=270, ...}) = 0 stat("/sys", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0 stat("/proc", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0 stat("/dev", {st_mode=S_IFDIR|0755, st_size=3100, ...}) = 0 stat("/sys/kernel/security", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 stat("/dev/shm", {st_mode=S_IFDIR|S_ISVTX|0777, st_size=40, ...}) = 0 stat("/dev/pts", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 stat("/run", {st_mode=S_IFDIR|0755, st_size=900, ...}) = 0 stat("/sys/fs/cgroup", {st_mode=S_IFDIR|0755, st_size=340, ...}) = 0 stat("/sys/fs/cgroup/systemd", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 stat("/sys/fs/pstore", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 stat("/sys/fs/cgroup/cpuset", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 stat("/sys/fs/cgroup/cpu,cpuacct", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 stat("/sys/fs/cgroup/pids", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 stat("/sys/fs/cgroup/devices", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 stat("/sys/fs/cgroup/net_cls,net_prio", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 stat("/sys/fs/cgroup/freezer", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 stat("/sys/fs/cgroup/perf_event", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 stat("/sys/fs/cgroup/hugetlb", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 stat("/sys/fs/cgroup/blkio", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 stat("/sys/fs/cgroup/memory", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 stat("/sys/kernel/config", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 stat("/", {st_mode=S_IFDIR|0555, st_size=270, ...}) = 0 stat("/proc/sys/fs/binfmt_misc", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 stat("/dev/mqueue", {st_mode=S_IFDIR|S_ISVTX|0777, st_size=40, ...}) = 0 stat("/sys/kernel/debug", {st_mode=S_IFDIR|0700, st_size=0, ...}) = 0 stat("/dev/hugepages", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 stat("/opt", {st_mode=S_IFDIR|0755, st_size=129, ...}) = 0 stat("/run/user/0", {st_mode=S_IFDIR|0700, st_size=40, ...}) = 0 stat("/proc/sys/fs/binfmt_misc", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 stat("/mnt", |
可以查看到卡到了/mnt，说明这个目录存在问题，一般是通过挂载网络文件系统，由于网络故障或服务端问题导致服务不可用
strace显示的日志可能出现ctrl+C终止不了的情况，打开新的终端，找到进程kill掉就可以了
2.使用mount查看挂载情况
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[root@localhost ~]# <strong>mount</strong> sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime) proc on /proc type proc (rw,nosuid,nodev,noexec,relatime) devtmpfs on /dev type devtmpfs (rw,nosuid,size=8122700k,nr_inodes=2030675,mode=755) securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime) tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev) devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000) tmpfs on /run type tmpfs (rw,nosuid,nodev,mode=755) tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755) cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd) pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime) cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset) cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpuacct,cpu) cgroup on /sys/fs/cgroup/pids type cgroup (rw,nosuid,nodev,noexec,relatime,pids) cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices) cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup (rw,nosuid,nodev,noexec,relatime,net_prio,net_cls) cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer) cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event) cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,hugetlb) cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio) cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory) configfs on /sys/kernel/config type configfs (rw,relatime) /dev/sda1 on / type xfs (rw,relatime,attr2,inode64,noquota) systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=23,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=13268) mqueue on /dev/mqueue type mqueue (rw,relatime) debugfs on /sys/kernel/debug type debugfs (rw,relatime) hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime) /dev/sda3 on /opt type xfs (rw,relatime,attr2,inode64,noquota) tmpfs on /run/user/0 type tmpfs (rw,nosuid,nodev,relatime,size=1626728k,mode=700) binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,relatime) <strong>192.168.1.7:/opt/nfsdata on /mnt type nfs4 (rw,relatime,vers=4.1,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=192.168.1.11,local_lock=none,addr=192.168.1.7)</strong> |
可以看到我的nfs文件系统挂载到了/mnt，因为nfs被我停止了，所以导致df -h时卡住无响应
3.解决反方法
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umount -fl 192.168.1.7:/opt/nfsdata #强制卸载 |
