first draft
This commit is contained in:
Denis Knauf
commit
d623efde64
4
.gitignore
vendored
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4
.gitignore
vendored
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@ -0,0 +1,4 @@
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*.sw[pomnqrst]
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*.gem
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Gemfile.lock
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.rake_tasks
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5
Gemfile
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5
Gemfile
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@ -0,0 +1,5 @@
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source 'https://rubygems.org'
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gem 'ruby-lxc', git: 'https://git.denkn.at/deac/ruby-lxc'
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gem 'prometheus-client'
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gem 'puma'
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gem 'rack'
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14
config.ru
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14
config.ru
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@ -0,0 +1,14 @@
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require 'rack'
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require_relative 'pvect-exporter'
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require 'prometheus/client/formats/text'
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run lambda {|env|
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req = Rack::Request.new env
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case req.path
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when "/metrics"
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collector = PveCtCollector.new
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[200, {"Content-Type" => "text/plain"}, [Prometheus::Client::Formats::Text.marshal( collector.collect)]]
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else
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[404, {"Content-Type" => "text/plain"}, ["Not found\nYou want to try /metrics?\n"]]
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end
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}
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327
pvect-exporter.rb
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327
pvect-exporter.rb
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@ -0,0 +1,327 @@
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#!/usr/bin/env ruby
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require 'pathname'
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require 'fiddle'
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require 'fiddle/import'
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require 'json'
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require 'lxc'
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require 'prometheus/client'
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=begin
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class LXC::CT
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def initialize name
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extend Fiddle::Importer
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dlload Fiddle.dlopen( nil)
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extern 'lxc_container *lxc_container_new( const char* name, const char* config_path)'
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def initialize name, config = nil
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lxc_container_new name, config
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end
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end
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end
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=end
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class File
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module Statfs
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Magics = {}
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#=begin
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Line = <<~EOF
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ADFS 0xadf5
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AFFS 0xadff
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AFS 0x5346414F
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AUTOFS 0x0187
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CODA 0x73757245
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CRAMFS 0x28cd3d45
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CRAMFS_WEND 0x453dcd28
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DEBUGFS 0x64626720
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SECURITYFS 0x73636673
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SELINUX 0xf97cff8c
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SMACK 0x43415d53
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RAMFS 0x858458f6
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TMPFS 0x01021994
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HUGETLBFS 0x958458f6
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SQUASHFS 0x73717368
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ECRYPTFS 0xf15f
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EFS 0x414A53
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EROFS_V1 0xE0F5E1E2
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EXT2 0xEF53
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EXT3 0xEF53
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XENFS 0xabba1974
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EXT4 0xEF53
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BTRFS 0x9123683E
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NILFS 0x3434
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F2FS 0xF2F52010
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HPFS 0xf995e849
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ISOFS 0x9660
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JFFS2 0x72b6
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XFS 0x58465342
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PSTOREFS 0x6165676C
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EFIVARFS 0xde5e81e4
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HOSTFS 0x00c0ffee
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OVERLAYFS 0x794c7630
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MINIX 0x137F
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MINIX2 0x138F
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MINIX2 0x2468
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MINIX22 0x2478
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MINIX3 0x4d5a
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MSDOS 0x4d44
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NCP 0x564c
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NFS 0x6969
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OCFS2 0x7461636f
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OPENPROM 0x9fa1
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QNX4 0x002f
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QNX6 0x68191122
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AFS_FS 0x6B414653
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REISERFS 0x52654973
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REISERFS "ReIsErFs"
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REISER2FS "ReIsEr2Fs"
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REISER2FS_JR "ReIsEr3Fs"
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SMB 0x517B
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CGROUP 0x27e0eb
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CGROUP2 0x63677270
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RDTGROUP 0x7655821
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STACK_END 0x57AC6E9D
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TRACEFS 0x74726163
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V9FS 0x01021997
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BDEVFS 0x62646576
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DAXFS 0x64646178
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BINFMTFS 0x42494e4d
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DEVPTS 0x1cd1
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BINDERFS 0x6c6f6f70
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FUTEXFS 0xBAD1DEA
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PIPEFS 0x50495045
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PROC 0x9fa0
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SOCKFS 0x534F434B
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SYSFS 0x62656572
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USBDEVICE 0x9fa2
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MTD_INODE_FS 0x11307854
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ANON_INODE_FS 0x09041934
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BTRFS_TEST 0x73727279
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NSFS 0x6e736673
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BPF_FS 0xcafe4a11
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AAFS 0x5a3c69f0
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ZONEFS 0x5a4f4653
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UDF 0x15013346
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BALLOON_KVM 0x13661366
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ZSMALLOC 0x58295829
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DMA_BUF 0x444d4142
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DEVMEM 0x454d444d
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Z3FOLD 0x33
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PPC_CMM 0xc7571590
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EOF
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Line.each_line do |l|
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n, v = l.split(/\s+/)[0..1]
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v =
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case v
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when /^0x(\h+)$/ then $1.to_i 16
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when /^"([^"]+)"$/ then $1
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else raise "Unknown value: #$1"
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end
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Magics[v] = n.downcase.to_sym
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end
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#=end
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extend Fiddle::Importer
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dlload Fiddle.dlopen( nil)
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Struct_statfs = struct <<~EOS
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long type,
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long bsize,
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unsigned long blocks,
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unsigned long bfree,
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unsigned long bavail,
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unsigned long files,
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unsigned long ffree,
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int fsid[2],
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long namelen,
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long frsize,
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long flags,
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long spare[4]
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EOS
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class Struct_statfs
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def fstypename
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Magics[type]
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end
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def to_h
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{type: type, fstypename: fstypename, bsize: bsize, blocks: blocks, bfree: bfree, bavail: bavail, files: files, ffree: ffree, fsid: fsid, namelen: namelen, frsize: frsize, flags: flags, spare: spare}
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end
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end
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StatfsFun = Fiddle::Function.new handler['statfs'], [Fiddle::TYPE_VOIDP, Fiddle::TYPE_VOIDP], Fiddle::TYPE_INT
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#extern 'int statfs( const char *__file, struct statfs *__buf)'
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def self.new file
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buf = Struct_statfs.malloc
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val = StatfsFun.call file, buf
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raise SystemCallError.new( "statfs(#{file.inspect})", Fiddle.last_error) unless val == 0
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buf
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end
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end
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end
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class NS
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#extend FFI::Library
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#ffi_lib 'c'
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#attach_function :setns_without_exception_handling, :setns, %i[int int], :int
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extend Fiddle::Importer
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dlload Fiddle.dlopen( nil)
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SetNS_Function = Fiddle::Function.new handler['setns'], [Fiddle::TYPE_VOIDP, Fiddle::TYPE_VOIDP], Fiddle::TYPE_INT
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class <<self
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def setns fd, t
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#r = setns_without_exception_handling fd.to_i, t.to_i
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#SystemCallError.new "setns(#{fd.to_i})", FFI::LastError.error if -1 == r
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r = SetNS_Function.call fd.to_i, t.to_i
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SystemCallError.new "setns(#{fd.to_i})", Fiddle.last_error if -1 == r
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r
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end
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def _open_nsfd pid, type
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File.open "/proc/%d/ns/%s" % [pid, type]
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end
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def open pid, *types, &exe
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ns = new pid, *types
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if block_given?
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begin yield ns
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ensure ns.close
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end
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else ns
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end
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end
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def change pid, *types, &exe
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open pid, *types do |ns|
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ns.change &exe
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end
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end
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end
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attr_reader :pid, :fds, :types
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def initialize pid, *types
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@pid, @fds = pid, {}
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types.map {|t| @fds[t] = self.class._open_nsfd pid, t }
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end
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def close
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@fds.each {|t, fd| fd.close }
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end
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def change &block
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@owns = @fds.map {|t, _f| Own[t] }
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begin
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@fds.each {|type, fd| self.class.setns fd, 0 }
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yield
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ensure
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@owns.each {|fd| self.class.setns fd, 0 }
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end
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end
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Own = Hash.new {|h, ns| h[ns] = _open_nsfd $$, ns }
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end
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class MountInfo
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attr_reader :major, :minor, :mp, :dev, :type, :opts
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# 4979 4977 0:213 / /proc rw,nosuid,nodev,noexec,relatime shared:2416 - proc proc rw
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def initialize *args
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i = args.find_index {|x| '-' == x }
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args2 = args[(i+1)..-1]
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ma, mi = args[2].split ':'
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@major, @minor, @mp, @dev, @type, @opts =
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ma.to_i, mi.to_i, args[4], args2[1], args2[0], args2[2].split( ',')
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end
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class << self
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def parse line
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new *line.split( ' ')
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end
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def of pid
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Pathname.new( "/proc/#{pid}/mountinfo").readlines.map {|l| parse l }
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end
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end
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end
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=begin
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LxcStartExe = Pathname.new "/usr/bin/lxc-start"
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def get_running_ct_pids &block
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return to_enum( __method__) unless block_given?
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cts = []
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Pathname.new( "/proc").each_child do |fn|
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next if /\D/ =~ fn.basename.to_s
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exepath = fn + 'exe'
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next unless exepath.exist? and LxcStartExe == exepath.readlink
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pid = fn.basename.to_s.to_i
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cts.push pid
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end
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Pathname.new( "/proc").each_child do |fn|
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next if /\D/ =~ fn.basename.to_s
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statuspath = fn + 'status'
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ppid = statuspath.read.match( /^PPid:\s+(\d+)$/)[1].to_i
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next unless cts.include? ppid
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yield fn.basename.to_s.to_i
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end
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end
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pids = get_running_ct_pids
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=end
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class PveCtCollector
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def fetch
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LXC.list_containers.map {|n|LXC::Container.new n}.select( &:running?).each do |ct|
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pid = ct.init_pid
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mis = MountInfo.of pid
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NS.change pid, :pid, :mnt do
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mis.each do |mi|
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next if %w[devpts devtmpfs fuse.lxcfs].include? mi.type
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statfs = File::Statfs.new mi.mp
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yield ct, mi.mp, statfs
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end
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end
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end
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end
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def initialize registry = nil
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@prometheus ||= Prometheus::Client::Registry.new
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@info = Prometheus::Client::Gauge.new :pvect_filesystem_info, labels: %i[id mountpoint name fstype], docstring: 'CT Info'
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@totalb = Prometheus::Client::Gauge.new :pvect_filesystem_total_bytes, labels: %i[id mountpoint], docstring: 'Total bytes in filesystem'
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@freeb = Prometheus::Client::Gauge.new :pvect_filesystem_free_bytes, labels: %i[id mountpoint], docstring: 'Free bytes in filesystem'
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@availb = Prometheus::Client::Gauge.new :pvect_filesystem_available_bytes, labels: %i[id mountpoint], docstring: 'Free bytes available to unprivileged user'
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@totalf = Prometheus::Client::Gauge.new :pvect_filesystem_total_files, labels: %i[id mountpoint], docstring: 'Total files in filesystem'
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@freef = Prometheus::Client::Gauge.new :pvect_filesystem_free_files, labels: %i[id mountpoint], docstring: 'Free files in filesystem'
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[@info, @totalb, @freeb, @availb, @totalf, @freef].each {|g| @prometheus.register g }
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end
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def collect
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rd, wr = IO.pipe
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pid = fork do
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rd.close
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fetch do |ct, mp, st|
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next unless st.fstypename and 0 < st.blocks
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wr.puts st.to_h.merge( mp: mp, id: ct.name, name: ct.config_item( 'lxc.uts.name')).to_json
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end
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wr.close
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exit 0
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end
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wr.close
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rd.each_line do |l|
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st = OpenStruct.new JSON.parse( l)
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labels = {id: st.id, mountpoint: st.mp}
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@info.set 1, labels: labels.merge( name: st.name, fstype: st.fstypename)
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@totalb.set st.bsize*st.blocks, labels: labels
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@freeb.set st.bsize*st.bfree, labels: labels
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@availb.set st.bsize*st.bavail, labels: labels
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@totalf.set st.files, labels: labels
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@freef.set st.ffree, labels: labels
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end
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rd.close
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Process.wait pid
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@prometheus
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end
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end
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