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Full Discussion: How to fix and manage data in rescue mode?
Top Forums UNIX for Beginners Questions & Answers How to fix and manage data in rescue mode? Post 303036497 by baris35 on Friday 28th of June 2019 04:14:57 PM
Old 06-28-2019
Hello Rudic,
CPU is 100% and server is not accessible via ssh in normal boot mode.

The problem started after nfs installation. I received a warning message from authorities emphasizing that nfs usage has some risks as attackers could sniff the system via udp ports. Not sure about that. Company replaced the motherboard in the morning which did not solve the issue. After an eight hours of intervention process they said, server is under attack.
I am still not sure about that so I am planning to edit my settings in rescue mode.

Regarding system disk details:
Code:
root@rescue:~# df -aTh
Filesystem                        Type        Size  Used Avail Use% Mounted on
none                              proc           0     0     0    - /proc
none                              sysfs          0     0     0    - /sys
devtmpfs                          devtmpfs     16G     0   16G   0% /dev
178.33.124.49:/home/pub/rescue.v8 nfs         1.8T  298G  1.4T  18% /nfs
tmpfs                             tmpfs        16G  1.7M   16G   1% /rw
aufs                              aufs         16G  1.7M   16G   1% /
178.33.124.49:/home/pub/pro-power nfs         1.8T  298G  1.4T  18% /power
178.33.124.49:/home/pub/commonnfs nfs         1.8T  298G  1.4T  18% /common
securityfs                        securityfs     0     0     0    - /sys/kernel/security
tmpfs                             tmpfs        16G     0   16G   0% /dev/shm
devpts                            devpts         0     0     0    - /dev/pts
tmpfs                             tmpfs        16G  9.7M   16G   1% /run
tmpfs                             tmpfs       5.0M     0  5.0M   0% /run/lock
tmpfs                             tmpfs        16G     0   16G   0% /sys/fs/cgroup
cgroup                            cgroup         0     0     0    - /sys/fs/cgroup/systemd
pstore                            pstore         0     0     0    - /sys/fs/pstore
cgroup                            cgroup         0     0     0    - /sys/fs/cgroup/cpuset
cgroup                            cgroup         0     0     0    - /sys/fs/cgroup/cpu,cpuacct
cgroup                            cgroup         0     0     0    - /sys/fs/cgroup/blkio
cgroup                            cgroup         0     0     0    - /sys/fs/cgroup/memory
cgroup                            cgroup         0     0     0    - /sys/fs/cgroup/devices
cgroup                            cgroup         0     0     0    - /sys/fs/cgroup/freezer
cgroup                            cgroup         0     0     0    - /sys/fs/cgroup/net_cls,net_prio
cgroup                            cgroup         0     0     0    - /sys/fs/cgroup/pids
systemd-1                         autofs         0     0     0    - /proc/sys/fs/binfmt_misc
hugetlbfs                         hugetlbfs      0     0     0    - /dev/hugepages
debugfs                           debugfs        0     0     0    - /sys/kernel/debug
mqueue                            mqueue         0     0     0    - /dev/mqueue
tmpfs                             tmpfs        16G   12K   16G   1% /tmp
configfs                          configfs       0     0     0    - /sys/kernel/config
fusectl                           fusectl        0     0     0    - /sys/fs/fuse/connections
rpc_pipefs                        rpc_pipefs     0     0     0    - /run/rpc_pipefs

Kind regards
Boris
Last edited by baris35; 06-28-2019 at 06:06 PM.. Reason: requested info added
 

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LEARN ABOUT FREEBSD

tc-cgroup

Cgroup classifier in tc(8)					       Linux						Cgroup classifier in tc(8)

NAME

       cgroup - control group based traffic control filter

SYNOPSIS

       tc filter ... cgroup [ match EMATCH_TREE ] [ action ACTION_SPEC ]

DESCRIPTION

       This  filter  serves as a hint to tc that the assigned class ID of the net_cls control group the process the packet originates from belongs
       to should be used for classification. Obviously, it is useful for locally generated packets only.

OPTIONS

       action ACTION_SPEC
	      Apply an action from the generic actions framework on matching packets.

       match EMATCH_TREE
	      Match packets using the extended match infrastructure. See tc-ematch(8)  for  a  detailed  description  of  the  allowed	syntax	in
	      EMATCH_TREE.

EXAMPLES

       In order to use this filter, a net_cls control group has to be created first and class as well as process ID(s) assigned to it. The follow-
       ing creates a net_cls cgroup named "foobar":

	      modprobe cls_cgroup
	      mkdir /sys/fs/cgroup/net_cls
	      mount -t cgroup -onet_cls net_cls /sys/fs/cgroup/net_cls
	      mkdir /sys/fs/cgroup/net_cls/foobar

       To assign a class ID to the created cgroup, a file named net_cls.classid has to be created which contains the class ID to be assigned as  a
       hexadecimal,  64bit  wide  number.  The upper 32bits are reserved for the major handle, the remaining hold the minor. So a class ID of e.g.
       ff:be has to be written like so: 0xff00be (leading zeroes may be omitted). To continue the above example, the following	assigns  class	ID
       1:2 to foobar cgroup:

	      echo 0x10002 > /sys/fs/cgroup/net_cls/foobar/net_cls.classid

       Finally some PIDs can be assigned to the given cgroup:

	      echo 1234 > /sys/fs/cgroup/net_cls/foobar/tasks
	      echo 5678 > /sys/fs/cgroup/net_cls/foobar/tasks

       Now by simply attaching a cgroup filter to a qdisc makes packets from PIDs 1234 and 5678 be pushed into class 1:2.

SEE ALSO

       tc(8), tc-ematch(8),
       the file Documentation/cgroups/net_cls.txt of the Linux kernel tree

iproute2							    21 Oct 2015 					Cgroup classifier in tc(8)
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