sda 8:0 0 40G 0 disk
└─sda1 8:1 0 40G 0 part /
/dev/sda1: UUID="8ac075e3-1124-4bb6-bef7-a6811bf8b870" TYPE="xfs"
Disk /dev/sda: 42.9 GB, 42949672960 bytes, 83886080 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x0009ef88
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 83886079 41942016 83 Linux
Model: ATA VBOX HARDDISK (scsi)
Disk /dev/sda: 42.9GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:
Number Start End Size Type File system Flags
1 1049kB 42.9GB 42.9GB primary xfs boot
- Какой размер дисков?
- 40 GB (41921540 bytes)
- Есть ли неразмеченное место на дисках?
- Нет
- Какой размер партиций?
/dev/sda1 * 2048 83886079 41942016 83 Linux
- Какая таблица партционирования используется?
- msdos
- Какой диск, партция или лвм том смонтированы в / *sda1
Parallel mksquashfs: Using 1 processor
Creating 4.0 filesystem on mai.sqsh, block size 131072.
[===============================================================================================================================================|] 27/27 100%
Exportable Squashfs 4.0 filesystem, gzip compressed, data block size 131072
compressed data, compressed metadata, compressed fragments, compressed xattrs
duplicates are removed
Filesystem size 50.94 Kbytes (0.05 Mbytes)
64.88% of uncompressed filesystem size (78.51 Kbytes)
Inode table size 385 bytes (0.38 Kbytes)
22.36% of uncompressed inode table size (1722 bytes)
Directory table size 379 bytes (0.37 Kbytes)
65.12% of uncompressed directory table size (582 bytes)
Xattr table size 54 bytes (0.05 Kbytes)
100.00% of uncompressed xattr table size (54 bytes)
Number of duplicate files found 1
Number of inodes 32
Number of files 28
Number of fragments 1
Number of symbolic links 0
Number of device nodes 0
Number of fifo nodes 0
Number of socket nodes 0
Number of directories 4
Number of ids (unique uids + gids) 1
Number of uids 1
root (0)
Number of gids 1
root (0)
/dev/sda1 40G 3.3G 37G 9% /
devtmpfs 488M 0 488M 0% /dev
tmpfs 496M 0 496M 0% /dev/shm
tmpfs 496M 6.7M 489M 2% /run
tmpfs 496M 0 496M 0% /sys/fs/cgroup
tmpfs 100M 0 100M 0% /run/user/1000
/dev/loop0 128K 128K 0 100% /mnt/mai
/dev/sda1 20971008 36760 20934248 1% /
devtmpfs 124867 309 124558 1% /dev
tmpfs 126871 1 126870 1% /dev/shm
tmpfs 126871 381 126490 1% /run
tmpfs 126871 16 126855 1% /sys/fs/cgroup
tmpfs 126871 1 126870 1% /run/user/1000
/dev/loop0 32 32 0 100% /mnt/mai
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime,seclabel)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
devtmpfs on /dev type devtmpfs (rw,nosuid,seclabel,size=499468k,nr_inodes=124867,mode=755)
securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev,seclabel)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,seclabel,gid=5,mode=620,ptmxmode=000)
tmpfs on /run type tmpfs (rw,nosuid,nodev,seclabel,mode=755)
tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,seclabel,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,seclabel,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/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,seclabel,cpuacct,cpu)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,seclabel,freezer)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,seclabel,devices)
cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup (rw,nosuid,nodev,noexec,relatime,seclabel,net_prio,net_cls)
cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,seclabel,hugetlb)
cgroup on /sys/fs/cgroup/pids type cgroup (rw,nosuid,nodev,noexec,relatime,seclabel,pids)
cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,seclabel,perf_event)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,seclabel,blkio)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,seclabel,cpuset)
cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,seclabel,memory)
configfs on /sys/kernel/config type configfs (rw,relatime)
/dev/sda1 on / type xfs (rw,relatime,seclabel,attr2,inode64,noquota)
selinuxfs on /sys/fs/selinux type selinuxfs (rw,relatime)
systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=24,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=13390)
mqueue on /dev/mqueue type mqueue (rw,relatime,seclabel)
hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime,seclabel)
debugfs on /sys/kernel/debug type debugfs (rw,relatime)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw,relatime)
tmpfs on /run/user/1000 type tmpfs (rw,nosuid,nodev,relatime,seclabel,size=101500k,mode=700,uid=1000,gid=1000)
/home/vagrant/mai.sqsh on /mnt/mai type squashfs (ro,relatime,seclabel)
- Какая файловая система примонтирована в /
- sda1
- С какими опциями примонтирована файловая система в /
- type - xfs, rw,relatime,seclabel,attr2,inode64,noquota
- Какой размер файловой системы приментированной в /mnt/mai
- 128K
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.0303084 s, 3.5 GB/s
total used free shared buff/cache available
Mem: 991M 83M 125M 106M 782M 602M
Swap: 2.0G 0B 2.0G
total used free shared buff/cache available
Mem: 991M 83M 225M 6.7M 682M 703M
Swap: 2.0G 0B 2.0G
- Что такое tmpfs
- Временное файловое хранилище для монтирования файловых систем, размещаемых в ОЗУ
- Какая часть памяти изменялась?
- Свободная
UID PID PPID C SZ RSS PSR STIME TTY TIME CMD
root 1 0 0 32025 6672 0 08:15 ? 00:00:01 /usr/lib/systemd/systemd --switched-root --system --deserialize 21
root 2 0 0 0 0 0 08:15 ? 00:00:00 [kthreadd]
root 3 2 0 0 0 0 08:15 ? 00:00:00 [ksoftirqd/0]
root 5 2 0 0 0 0 08:15 ? 00:00:00 [kworker/0:0H]
root 6 2 0 0 0 0 08:15 ? 00:00:00 [kworker/u2:0]
root 7 2 0 0 0 0 08:15 ? 00:00:00 [migration/0]
...
postfix 28046 2545 0 22440 4044 0 09:55 ? 00:00:00 pickup -l -t unix -u
root 28050 4750 0 25711 5500 0 09:59 ? 00:00:00 /sbin/dhclient -d -q -sf /usr/libexec/nm-dhcp-helper -pf /var/run/dhclient-eth0.pid -lf /var/l
root 28174 2397 0 38665 5556 0 10:00 ? 00:00:00 sshd: vagrant [priv]
vagrant 28177 28174 0 38665 2424 0 10:00 ? 00:00:00 sshd: vagrant@pts/0
vagrant 28178 28177 0 29092 3032 0 10:00 pts/0 00:00:00 -bash
root 28238 28178 0 47976 2392 0 10:02 pts/0 00:00:00 su
root 28242 28238 0 29098 3052 0 10:02 pts/0 00:00:00 bash
root 28295 2 0 0 0 0 10:27 ? 00:00:00 [kworker/0:2]
root 28317 2 0 0 0 0 10:30 ? 00:00:00 [loop0]
root 28349 2 0 0 0 0 10:53 ? 00:00:00 [kworker/0:1]
root 28366 2 0 0 0 0 11:01 ? 00:00:00 [kworker/0:0]
root 28367 28242 0 38841 1856 0 11:01 pts/0 00:00:00 ps -eF
PID TTY STAT TIME COMMAND
9 ? R 0:00 [rcu_sched]
28366 ? R 0:00 [kworker/0:0]
28368 pts/0 R+ 0:00 ps rx
...
2393 ? 00:00:01 tuned
2395 ? 00:00:00 rsyslogd
2397 ? 00:00:00 sshd
28174 ? 00:00:00 \_ sshd
28177 ? 00:00:00 \_ sshd
28178 pts/0 00:00:00 \_ bash
28238 pts/0 00:00:00 \_ su
28242 pts/0 00:00:00 \_ bash
28369 pts/0 00:00:00 \_ ps
2545 ? 00:00:00 master
2554 ? 00:00:00 \_ qmgr
28046 ? 00:00:00 \_ pickup
4750 ? 00:00:00 NetworkManager
28050 ? 00:00:00 \_ dhclient
5607 ? 00:00:00 crond
5715 ? 00:00:00 lvmetad
5870 ? 00:00:00 auditd
UID PID PPID LWP C NLWP STIME TTY TIME CMD
root 1 0 1 0 1 08:15 ? 00:00:01 /usr/lib/systemd/systemd --switched-root --system --deserialize 21
root 2 0 2 0 1 08:15 ? 00:00:00 [kthreadd]
root 3 2 3 0 1 08:15 ? 00:00:00 [ksoftirqd/0]
root 5 2 5 0 1 08:15 ? 00:00:00 [kworker/0:0H]
root 6 2 6 0 1 08:15 ? 00:00:00 [kworker/u2:0]
root 7 2 7 0 1 08:15 ? 00:00:00 [migration/0]
root 8 2 8 0 1 08:15 ? 00:00:00 [rcu_bh]
root 9 2 9 0 1 08:15 ? 00:00:00 [rcu_sched]
root 10 2 10 0 1 08:15 ? 00:00:00 [lru-add-drain]
...
- Какие процессы в системе порождают дочерние процессы через fork
- Обычные процессы
- Какие процессы в системе являются мультитредовыми
- Несколько одинаковых процессов с одним pid но с разными lwp, имеют общую память и процессорное время, в отличие от форкнутых
-
Что подсчитывается этой командой
- ps axo rss показывает сколько памяти в КБ "ест" процесс. tail -n +2 показывает первые 2 строки. paste -sd+ мерджит два файла с разделителями TAB. bc - утилита-калькулятор. В итоге команда дает число 113820
-
Почему цифра такая странная
- Сумма всех кбайт, потребляемых процессами
PID User Command Swap USS PSS RSS
1546 root /sbin/agetty --noclear tty1 0 176 233 868
5870 root /sbin/auditd 0 540 602 1088
1282 rpc /sbin/rpcbind -w 0 588 632 1268
1317 root /usr/sbin/gssproxy -D 0 732 788 1420
5607 root /usr/sbin/crond -n 0 688 805 1680
1331 chrony /usr/sbin/chronyd 0 764 864 1816
1407 root /usr/lib/systemd/systemd-lo 0 792 864 1732
28625 root su 0 636 1007 2400
28594 vagrant sshd: vagrant@pts/0 0 320 1103 2428
2545 root /usr/libexec/postfix/master 0 1144 1236 2152
1261 dbus /usr/bin/dbus-daemon --syst 0 1000 1287 2728
1051 root /usr/lib/systemd/systemd-jo 0 828 1449 2896
2397 root /usr/sbin/sshd -D -u0 0 1028 1604 4336
2554 postfix qmgr -l -t unix -u 0 1228 1744 4124
28651 postfix pickup -l -t unix -u 0 1208 1768 4068
28595 vagrant -bash 0 1348 1859 3024
28629 root bash 0 1372 1881 3040
28591 root sshd: vagrant [priv] 0 532 1959 5552
2395 root /usr/sbin/rsyslogd -n 0 1580 2225 3852
5715 root /usr/sbin/lvmetad -f 0 1672 2276 4152
1092 root /usr/lib/systemd/systemd-ud 0 2376 2972 4928
28506 root /sbin/dhclient -d -q -sf /u 0 2972 3338 5504
1 root /usr/lib/systemd/systemd -- 0 3936 4591 6672
4750 root /usr/sbin/NetworkManager -- 0 4692 5805 9200
29000 root python /usr/bin/smem 0 5672 6430 7872
1241 polkitd /usr/lib/polkit-1/polkitd - 0 9652 10697 13312
2393 root /usr/bin/python2 -Es /usr/s 0 12524 13924 17416
import os, time
import sys
print('Hello! I am an example')
pid = os.fork()
print('pid of my child is %s' % pid)
if pid == 0:
print('I am a child. Im going to sleep')
for i in range(1,40):
print('mrrrrr')
a = 2**i
print(a)
pid = os.fork()
if pid == 0:
print('my name is %s' % a)
sys.exit(0)
else:
print("my child pid is %s" % pid)
time.sleep(1)
print('Bye')
sys.exit(0)
else:
for i in range(1, 200):
print('HHHrrrrr')
time.sleep(1)
print(3**i)
#pid, status = os.waitpid(pid, 0)
#print("wait returned, pid = %d, status = %d" % (pid, status))
print('I am the parent')
PID User Command Swap USS PSS RSS
1546 root /sbin/agetty --noclear tty1 0 176 233 868
5870 root /sbin/auditd 0 540 584 1088
1282 rpc /sbin/rpcbind -w 0 588 630 1268
5607 root /usr/sbin/crond -n 0 688 778 1680
1317 root /usr/sbin/gssproxy -D 0 732 788 1420
1407 root /usr/lib/systemd/systemd-lo 0 792 863 1732
1331 chrony /usr/sbin/chronyd 0 764 864 1816
28625 root su 0 636 888 2400
29004 vagrant sshd: vagrant@pts/1 0 220 949 2400
28594 vagrant sshd: vagrant@pts/0 0 244 974 2428
2545 root /usr/libexec/postfix/master 0 1144 1234 2152
1261 dbus /usr/bin/dbus-daemon --syst 0 1000 1284 2728
1051 root /usr/lib/systemd/systemd-jo 0 828 1450 2900
2397 root /usr/sbin/sshd -D -u0 0 1028 1480 4336
28591 root sshd: vagrant [priv] 0 212 1533 5552
29001 root sshd: vagrant [priv] 0 212 1533 5552
28595 vagrant -bash 0 1344 1693 3024
28651 postfix pickup -l -t unix -u 0 1208 1709 4068
28629 root bash 0 1368 1716 3040
2554 postfix qmgr -l -t unix -u 0 1228 1722 4124
29005 vagrant -bash 0 1548 1902 3248
2395 root /usr/sbin/rsyslogd -n 0 1580 2226 3856
5715 root /usr/sbin/lvmetad -f 0 1672 2251 4152
1092 root /usr/lib/systemd/systemd-ud 0 2376 2971 4928
29040 vagrant python myfork.py 0 2608 3071 4660
28506 root /sbin/dhclient -d -q -sf /u 0 2972 3272 5504
1 root /usr/lib/systemd/systemd -- 0 3936 4589 6672
4750 root /usr/sbin/NetworkManager -- 0 4692 5780 9200
29083 root python /usr/bin/smem 0 5668 6207 7876
1241 polkitd /usr/lib/polkit-1/polkitd - 0 9652 10694 13312
2393 root /usr/bin/python2 -Es /usr/s 0 12520 13702 17416
vagrant 29004 29001 29004 0 1 13:37 ? 00:00:00 sshd: vagrant@pts/1
vagrant 29005 29004 29005 0 1 13:37 pts/1 00:00:00 -bash
vagrant 29085 29005 29085 0 1 13:41 pts/1 00:00:00 python myfork.py
vagrant 29086 29085 29086 0 1 13:41 pts/1 00:00:00 python myfork.py
vagrant 29087 29086 29087 0 1 13:41 pts/1 00:00:00 [python] <defunct>
vagrant 29088 29086 29088 0 1 13:41 pts/1 00:00:00 [python] <defunct>
vagrant 29089 29086 29089 0 1 13:41 pts/1 00:00:00 [python] <defunct>
vagrant 29090 29086 29090 0 1 13:41 pts/1 00:00:00 [python] <defunct>
vagrant 29091 29086 29091 0 1 13:41 pts/1 00:00:00 [python] <defunct>
vagrant 29093 29086 29093 0 1 13:41 pts/1 00:00:00 [python] <defunct>
vagrant 29094 29086 29094 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29095 29086 29095 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29097 29086 29097 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29098 29086 29098 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29099 29086 29099 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29101 29086 29101 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29102 29086 29102 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29103 29086 29103 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29104 29086 29104 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29105 29086 29105 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29106 29086 29106 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29107 29086 29107 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29108 29086 29108 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29109 29086 29109 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29111 29086 29111 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29112 29086 29112 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29113 29086 29113 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29114 29086 29114 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29115 29086 29115 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29116 29086 29116 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29117 29086 29117 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29119 29086 29119 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29120 29086 29120 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29121 29086 29121 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29122 29086 29122 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29124 29086 29124 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29125 29086 29125 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29126 29086 29126 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29128 29086 29128 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29129 29086 29129 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29130 29086 29130 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29131 29086 29131 0 1 13:42 pts/1 00:00:00 [python] <defunct>
vagrant 29132 29086 29132 1 1 13:42 pts/1 00:00:00 [python] <defunct>
29135 pts/1 S+ 0:00 python myfork.py
29136 pts/1 S+ 0:00 python myfork.py
29137 pts/1 Z+ 0:00 [python] <defunct>
29138 pts/1 Z+ 0:00 [python] <defunct>
29139 pts/1 Z+ 0:00 [python] <defunct>
29140 pts/1 Z+ 0:00 [python] <defunct>
29141 pts/1 Z+ 0:00 [python] <defunct>
29142 pts/1 Z+ 0:00 [python] <defunct>
29143 pts/1 Z+ 0:00 [python] <defunct>
29144 pts/1 Z+ 0:00 [python] <defunct>
29145 pts/1 Z+ 0:00 [python] <defunct>
- В другом терминале отследите порождение процессов
- Выше список
- Отследите какие состояния вы видите у процессов
- Выше список
- Почему появляются процессы со статусам Z
- Это процесс-зомби, у которого нет родителя
- Какой PID у основного процесса
- 29180
- Убейте основной процесс
bash kill -9 <pid>
- Killed в окне с запущенным процессом.
- Какой PPID стал у первого чайлда
- 29181
- насколько вы разобрались в скрипте и втом что он делает?
- Запускает основной процесс, потом запускает дочерний процесс. Если его PID - 0, то это дочерний процесс. Иначе же - это сам процесс.
vagrant 29446 29445 29446 0 1 16:22 pts/1 00:00:00 [python] <defunct>
После раскомментирования строк:
my child pid is 29548
my name is 549755813888
Bye
[vagrant@centos7-vm lab-processes]$
(gdb) attach 29777
Attaching to process 29777
Reading symbols from /usr/bin/python2.7...Reading symbols from /usr/bin/python2.7...(no debugging symbols found)...done.
(no debugging symbols found)...done.
...
(gdb) call waitpid(29808, 0, 0)
$1 = 29808
(gdb) call waitpid(29808, 0, 0)
$2 = -1
(gdb) detach
Detaching from program: /usr/bin/python2.7, process 29777
(gdb) quit
[root@centos7-vm vagrant]#
[vagrant@centos7-vm lab-processes]$ umount /mnt/mai
umount: /mnt/mai: target is busy.
(In some cases useful info about processes that use
the device is found by lsof(8) or fuser(1))
[root@centos7-vm mai]\# fuser -v /mnt/mai
USER PID ACCESS COMMAND
/mnt/mai: root kernel mount /mnt/mai
vagrant 29372 ..c.. bash
- Какие процессы мешают размонтировать директорию
- root 29372 ..c.. bash
- root kernel mount /mnt/mai
- Посмотреть
lsof -p <PID>
[root@centos7-vm mai]\# lsof -p 28629
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
bash 29372 vagrant cwd DIR 7,0 155 32 /mnt/mai
bash 29372 vagrant rtd DIR 8,1 255 64 /
bash 29372 vagrant txt REG 8,1 964608 100737157 /usr/bin/bash
bash 29372 vagrant mem REG 8,1 106075056 67395449 /usr/lib/locale/locale-archive
bash 29372 vagrant mem REG 8,1 61624 556830 /usr/lib64/libnss_files-2.17.so
bash 29372 vagrant mem REG 8,1 2156160 11299 /usr/lib64/libc-2.17.so
bash 29372 vagrant mem REG 8,1 19288 141652 /usr/lib64/libdl-2.17.so
bash 29372 vagrant mem REG 8,1 174576 11704 /usr/lib64/libtinfo.so.5.9
bash 29372 vagrant mem REG 8,1 163400 4823742 /usr/lib64/ld-2.17.so
bash 29372 vagrant mem REG 8,1 26254 11619 /usr/lib64/gconv/gconv-modules.cache
bash 29372 vagrant 0u CHR 136,1 0t0 4 /dev/pts/1
bash 29372 vagrant 1u CHR 136,1 0t0 4 /dev/pts/1
bash 29372 vagrant 2u CHR 136,1 0t0 4 /dev/pts/1
bash 29372 vagrant 255u CHR 136,1 0t0 4 /dev/pts/1
- Убить мешающий процесс и размонтировать директорию
[root@centos7-vm ~]\# kill -9 29372
[root@centos7-vm ~]\# umount /mnt/mai
[root@centos7-vm myfiles]\# mkdir myfiles
[root@centos7-vm myfiles]\# ls -l
total 1048516
-rw-r--r--. 1 root root 789991424 Nov 14 17:12 myfile
-rw-r--r--. 1 root root 84 Nov 14 17:04 test_write.py
[root@centos7-vm myfiles]\# ls -l
total 1048516
-rw-r--r--. 1 root root 919154688 Nov 14 17:12 myfile
-rw-r--r--. 1 root root 84 Nov 14 17:04 test_write.py
[root@centos7-vm myfiles]\# ls -l
total 1048516
-rw-r--r--. 1 root root 1026228224 Nov 14 17:12 myfile
-rw-r--r--. 1 root root 84 Nov 14 17:04 test_write.py
^Z
[3]+ Stopped python test_write.py
[root@centos7-vm myfiles]\# ls -l
total 1048516
-rw-r--r--. 1 root root 854614016 Nov 14 17:07 myfile
[root@centos7-vm myfiles]\# test myfile
[root@centos7-vm myfiles]\# jobs -l
[root@centos7-vm myfiles]\# fg
bash: fg: current: no such job
^Z
[4]+ Stopped python test_write.py
[root@centos7-vm myfiles]\# bg
bash: bg: current: no such job
[root@centos7-vm myfiles]\# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda1 41921540 7760892 34160648 19% /
devtmpfs 499468 0 499468 0% /dev
tmpfs 507484 0 507484 0% /dev/shm
tmpfs 507484 6848 500636 2% /run
tmpfs 507484 0 507484 0% /sys/fs/cgroup
tmpfs 101500 0 101500 0% /run/user/1000
[root@centos7-vm myfiles]\# du ~/myfiles
524228 /root/myfiles
[root@centos7-vm myfiles]\# rm myfile
[root@centos7-vm myfiles]\# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda1 41921540 6190644 35730896 15% /
devtmpfs 499468 0 499468 0% /dev
tmpfs 507484 0 507484 0% /dev/shm
tmpfs 507484 6848 500636 2% /run
tmpfs 507484 0 507484 0% /sys/fs/cgroup
tmpfs 101500 0 101500 0% /run/user/1000
[root@centos7-vm myfiles]\# du sh ~/myfiles
du: cannot access ‘sh’: No such file or directory
524228 /root/myfiles
[root@centos7-vm myfiles]\#
- Ситуация следующая - файл не удалился, потому что процесс был перемещен на задний фон и приостановлен, но не завершен. Файл находится все еще в используемом состоянии, процесс заснул.
[root@centos7-vm myfiles]\# strace -p 30193
strace: Process 30193 attached
--- stopped by SIGTSTP ---
[root@centos7-vm myfiles]\# lsof -p 30193
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
python 30193 root cwd DIR 8,1 41 67456820 /root/myfiles
python 30193 root rtd DIR 8,1 255 64 /
python 30193 root txt REG 8,1 7216 100738379 /usr/bin/python2.7
python 30193 root mem REG 8,1 106075056 67395449 /usr/lib/locale/locale-archive
python 30193 root mem REG 8,1 2156160 11299 /usr/lib64/libc-2.17.so
python 30193 root mem REG 8,1 1137024 141655 /usr/lib64/libm-2.17.so
python 30193 root mem REG 8,1 14496 11332 /usr/lib64/libutil-2.17.so
python 30193 root mem REG 8,1 19288 141652 /usr/lib64/libdl-2.17.so
python 30193 root mem REG 8,1 142232 11321 /usr/lib64/libpthread-2.17.so
python 30193 root mem REG 8,1 1847496 21194 /usr/lib64/libpython2.7.so.1.0
python 30193 root mem REG 8,1 163400 4823742 /usr/lib64/ld-2.17.so
python 30193 root 0u CHR 136,0 0t0 3 /dev/pts/0
python 30193 root 1u CHR 136,0 0t0 3 /dev/pts/0
python 30193 root 2u CHR 136,0 0t0 3 /dev/pts/0
python 30193 root 3w REG 8,1 2150162432 67456823 /root/myfiles/myfile (deleted)
python 30193 root 4r CHR 1,9 0t0 5339 /dev/urandom
[root@centos7-vm myfiles]\# kill -9 30193
[root@centos7-vm myfiles]\# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda1 41921540 3568636 38352904 9% /
devtmpfs 499468 0 499468 0% /dev
tmpfs 507484 0 507484 0% /dev/shm
tmpfs 507484 6816 500668 2% /run
tmpfs 507484 0 507484 0% /sys/fs/cgroup
tmpfs 101500 0 101500 0% /run/user/1000
[root@centos7-vm myfiles]\# du sh ~/myfiles
du: cannot access ‘sh’: No such file or directory
4 /root/myfiles
- Объяснение происходящего
- Завершися процесс, который писал в файл и был поставлен на паузу. Закрылся файловый дескриптор и теперь файл спокойно удалился.
Load average: 0.00 0.04 0.12
30421 root 20 0 119M 2504 1512 R 0.0 0.2 0:00.18 htop 2626 root 20 0 462M 15760 4508 S 0.0 1.6 0:04.48 /usr/bin/python2 -Es /usr/sbin/tuned -l -P 1 root 20 0 125M 4720 2180 S 0.0 0.5 0:01.61 /usr/lib/systemd/systemd --switched-root --system --deserialize 21
2393 root 20 0 462M 15760 4508 S 0.0 1.6 0:04.93 /usr/bin/python2 -Es /usr/sbin/tuned -l -P 2626 root 20 0 462M 15760 4508 S 0.0 1.6 0:04.48 /usr/bin/python2 -Es /usr/sbin/tuned -l -P 2641 root 20 0 462M 15760 4508 S 0.0 1.6 0:00.00 /usr/bin/python2 -Es /usr/sbin/tuned -l -P
[Unit] Description=AtopService
[Service]
Type=simple
User=root
WorkingDirectory=/bin
ExecStart=/bin/atop
[root@centos7-vm system]# systemctl load atops.service
Unknown operation 'load'.
[root@centos7-vm system]# systemctl enable atops.service
Failed to execute operation: Bad message
[root@centos7-vm system]# vim atops.service
[root@centos7-vm system]# systemctl status atops.service
● atops.service - AtopService
Loaded: loaded (/etc/systemd/system/atops.service; static; vendor preset: disabled)
Active: inactive (dead)
Nov 14 18:02:21 centos7-vm systemd[1]: [/etc/systemd/system/atops.service:1] Invalid section header '[Unit] Description=AtopService'
Nov 14 18:05:33 centos7-vm systemd[1]: [/usr/lib/systemd/system/atops.service:1] Invalid section header '[Unit] Description=AtopService'
Nov 14 18:06:32 centos7-vm systemd[1]: [/etc/systemd/system/atops.service:1] Invalid section header '[Unit] Description=AtopService'
Nov 14 18:06:51 centos7-vm systemd[1]: [/etc/systemd/system/atops.service:1] Invalid section header '[Unit] Description=AtopService'
[root@centos7-vm system]# systemctl enable atops.service
[root@centos7-vm system]# systemctl start atops.service
[root@centos7-vm system]# systemctl status atops.service
● atops.service - AtopService
Loaded: loaded (/etc/systemd/system/atops.service; static; vendor preset: disabled)
Active: active (running) since Thu 2019-11-14 18:07:26 UTC; 6s ago
Main PID: 30821 (atop)
CGroup: /system.slice/atops.service
└─30821 /bin/atop
Nov 14 18:07:26 centos7-vm atop[30821]: 985 0.00s 0.00s 0K 0K 0K 0K 1 S 0 0% xfs_mru_cache
Nov 14 18:07:26 centos7-vm atop[30821]: 990 0.00s 0.00s 0K 0K 0K 0K 1 S 0 0% xfs-buf/sda1
Nov 14 18:07:26 centos7-vm atop[30821]: 991 0.00s 0.00s 0K 0K 0K 0K 1 S 0 0% xfs-data/sda1
Nov 14 18:07:26 centos7-vm atop[30821]: 994 0.00s 0.00s 0K 0K 0K 0K 1 S 0 0% xfs-conv/sda1
Nov 14 18:07:26 centos7-vm atop[30821]: 995 0.00s 0.00s 0K 0K 0K 0K 1 S 0 0% xfs-cil/sda1
Nov 14 18:07:26 centos7-vm atop[30821]: 996 0.00s 0.00s 0K 0K 0K 0K 1 S 0 0% xfs-reclaim/sd
Nov 14 18:07:26 centos7-vm atop[30821]: 997 0.00s 0.00s 0K 0K 0K 0K 1 S 0 0% xfs-log/sda1
Nov 14 18:07:26 centos7-vm atop[30821]: 998 0.00s 0.00s 0K 0K 0K 0K 1 S 0 0% xfs-eofblocks/
Nov 14 18:07:26 centos7-vm atop[30821]: 1109 0.00s 0.00s 0K 0K 0K 0K 1 S 0 0% rpciod
Nov 14 18:07:26 centos7-vm atop[30821]: 1111 0.00s 0.00s 0K 0K 0K 0K 1 S 0 0% xprtiod
dd of=file bs=1 count=0 seek=3G
2395