ProcFS

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Information about currently running contexts can be found inside the /proc/virtual and /proc/virtnet directory. All information provided there is read-only, i.e. it cannot be used to change any values like other entries in /proc may do. Because it usually is world-readable you do not have to gain root access to look at this information.

Beside this information you can also control various debugging related settings using /proc/sys/vserver/debug if you have enabled debugging in your kernel configuration.

Note: The examples and descriptions are based on the 2.1.1 kernel patch. If you're using a previous version some information may not be present and/or available with a slightly different name.

Contents

Generic information

Currently there is only one file with generic information about the vserver host, that is /proc/virtual/info:

info 

# cat /proc/virtual/info
VCIVersion:     0002:0002
VCISyscall:     236
VCIKernel:      03000016
VCIVersion 
Current API version of the kernel
VCISyscall 
Syscall number of the vserver syscall
VCIKernel 
Bitmask of the CONFIG_VSERVER kernel configuration options

Beside VCIKernel the information provided in this file can also be gathered using the vserver-info utility from util-vserver. 

# vserver-info
Versions:
                  Kernel: 2.6.17-2-vserver-amd64
                  VS-API: 0x00020002
            util-vserver: 0.30.210; Sep 30 2006, 23:55:41
Features:
                      CC: gcc, gcc (GCC) 4.1.2 20060928 (prerelease) (Debian 4.1.1-15)
                     CXX: g++, g++ (GCC) 4.1.2 20060928 (prerelease) (Debian 4.1.1-15)
                CPPFLAGS: ''
                  CFLAGS: '-Wall -g  -O2 -std=c99 -Wall -pedantic -W -funit-at-a-time'
                CXXFLAGS: '-g -O2 -ansi -Wall -pedantic -W -fmessage-length=0 -funit-at-a-time'
              build/host: x86_64-pc-linux-gnu/x86_64-pc-linux-gnu
            Use dietlibc: yes
      Build C++ programs: yes
      Build C99 programs: yes
          Available APIs: compat,v11,fscompat,v13,net,oldproc,olduts
           ext2fs Source: e2fsprogs
   syscall(2) invocation: alternative
     vserver(2) syscall#: 236/glibc

Context specific information

info 

# cat /proc/virtual/<xid>/info
ID:	1001
Info:	83c37000
Init:	0
ID 
Context ID
Info 
Memory location of the vx_info structure
Init 
Real PID of the init process

status

This file contains general status information. 

# cat /proc/virtual/<xid>/status 
UseCnt:	38
Tasks:	16
Flags:	0000000002020010
BCaps:	00000000344c04ff
CCaps:	0000000000000101
UseCnt 
References to the vx_info struct
Tasks 
Number of processes (tasks) inside the context
Flags 
Capabilities and Flags
BCaps 
Capabilities and Flags
CCaps 
Capabilities and Flags

sched

This file contains information about the CPU Scheduler. 

# cat /proc/virtual/<xid>/sched 
FillRate:              1,1
Interval:              4,8
TokensMin:            15
TokensMax:           125
PrioBias:              0
VaVaVoom:              0
cpu 0: 0 0 0 0 0 R- 62 15 125 1/4 1/8
FillRate 
Number of tokens filled into the bucket at each interval
Interval 
Number of jiffies between each fill interval
TokensMin 
Minimum number of tokens to be scheduled
TokensMax 
Maximum number of tokens in the bucket
PrioBias 
Priority bias
VaVaVoom 
The calculated priority bonus a guest gets
cpu X
Ticks spent in user-space
Ticks spent in kernel-space
Ticks spent on hold
Token time ??
Idle time ??
On hold (H) or running (R)
Uses IDLE time (I) or not (-)
Current number of tokens
Minimum number of tokens to be scheduled
Maximum number of tokens in the bucket
Minimum number of tokens to be scheduled (IDLE time setting)
Maximum number of tokens in the bucket (IDLE time setting)

cacct

This file contains information about Context Accounting, including socket accounting and slab allocator accounting. 

# cat /proc/virtual/<xid>/cacct 
Type        recv #/bytes                   send #/bytes             fail #/bytes
UNSPEC:          0/0                     0/0                     0/0
UNIX:            0/0                     0/0                     0/0
INET:            0/0                     0/0                     0/0
INET6:           0/0                     0/0                     0/0
PACKET:          0/0                     0/0                     0/0
OTHER:           0/0                     0/0                     0/0

slab:           0        0 4294965416        0

page[0]:        0        0        0        0            0        0        0        0
page[1]:        0        0        0        0            0        0        0        0
page[2]:        0        0        0        0            0        0        0        0
page[3]:        0        0        0        0            0        0        0        0
page[4]:        0        0        0        0            0        0        0        0


cvirt

This file contains information about virtualized data, including context uptime bias, utsname settings, thread information and load average. Note: some fields are moved in nsproxy file with vs2.3.x. 

# cat /proc/virtual/<xid>/cvirt 
BiasUptime:	49.73
SysName:	Linux
NodeName:	XXXX.test.org
Release:	2.6.11-rc5
Version:	#12 Sun Feb 27 01:07:29 CET 2005
Machine:	i686
DomainName:	
nr_threads:	16
nr_running:	0
nr_unintr:	0
nr_onhold:	0
load_updates:	14585
loadavg:	0.00 0.00 0.00
total_forks:	272
BiasUptime 
Context uptime bias (System uptime - BiasUptime = Context uptime)
SysName 
Kernel name
NodeName 
Network node hostname
Release 
Kernel release
Version 
Kernel version
Machine 
Machine hardware name
DomainName 
Network node domainname
nr_threads 
Total number of threads
nr_running 
Number of running threads
nr_unintr 
Number of uninterruptible threads
nr_onhold 
Number of threads on hold
load_updates 
Total number of load average updates
loadavg 
Number of jobs in the run queue averaged over 1, 5, and 15 minutes
total_forks 
Total number of forks

nsproxy

Vs 2.3.x (experimental) only. 

NSProxy:	ffff81000460d338 [ffff81007cca9bc0,ffff8100378d5800,ffff8100378e7600]
Namespace:	ffff81007cca9bc0 [#2]
RootPath:	/
SysName:	Linux
NodeName:	lenny-amd64
Release:	2.6.26-1-vserver-amd64
Version:	#1 SMP Sat Jan 10 19:46:42 UTC 2009
Machine:	x86_64
DomainName:	(none)
SEMS:		250 32000 32 128  0
MSG:		8192 16384 286
SHM:		33554432 2097152  4096 0

limit

This file contains information about Resource Limits, including Context Accounting (i.e these do not appear in cacct). 

# cat /proc/virtual/<xid>/limit 
Limit    current             min/max                soft/hard           hits
PROC:          2               2/       2             -1/      -1            0
VM:         4024            4024/    4024             -1/      -1            0
VML:           0               0/       0             -1/      -1            0
RSS:          50              50/      50             -1/      -1            0
ANON:         33              33/      33             -1/      -1            0
FILES:        19              19/      19             -1/      -1            0
OFD:           5               5/       5             -1/      -1            0
LOCKS:         0               0/       0             -1/      -1            0
SOCK:          2               2/       2             -1/      -1            0
MSGQ:          0               0/       0             -1/      -1            0
SHM:           0               0/       0             -1/      -1            0
SEMA:          0               0/       0             -1/      -1            0
SEMS:          0               0/       0             -1/      -1            0
DENT:       2315            2315/    2315             -1/      -1            0
Limit 
Limit name/identifier
current 
Current value
min 
Minimum value since the last reset
max 
Maximum value since the last reset
soft 
Soft limit
hard 
hard limit
hits 
Total amount of current reaching hard

Debugging Control

The /proc/sys/vserver/debug directory is only present if you have enabled CONFIG_VSERVER_DEBUG during kernel compilation.

To enable debugging you can use a command similar to the following to enable debugging. Please see Kernel Debugging for more information. 

# echo 255 >/proc/sys/vserver/debug_switch
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