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Debug Tips

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ajayhn edited this page Feb 13, 2015 · 23 revisions

Useful Chrome Browser applications

System Debugging Tools

  • strace
    strace -p <pid> -e trace=network
  • lsof
    lsof -p <pid>
  • tcpdump
    tcpdump -ni any port <portnum> -A -s 1500

Text-only tools when GUI is not accessible

  • contrail-logs to gather details when UI access is not possible
  • To view xml output with indentation
    curl -sq http://localhost:8085/Snh_ItfReq? | python -c 'import sys;import xml.dom.minidom;s=sys.stdin.read();print xml.dom.minidom.parseString(s).toprettyxml()' | less
  • To locate particular stanza based on child value
    • (for e.g. interface stanza based on name of vhost0, port uuid or vm uuid)
    (export KEY=name VAL=vhost0; curl -s -q http://localhost:8085/Snh_ItfReq? | python -c 'import sys, os;from lxml import etree as et;s=sys.stdin.read();root=et.fromstring(s); print et.tostring(root.xpath(".//%s[text()=\"%s\"]/.." %(os.environ["KEY"], os.environ["VAL"]))[0], pretty_print=True)')
    (export KEY=uuid VAL=29ec90f1-c637-4cc8-8edb-125ce3dcc0f9; curl -s -q http://localhost:8085/Snh_ItfReq? | python -c 'import sys, os;from lxml import etree as et;s=sys.stdin.read();root=et.fromstring(s); print et.tostring(root.xpath(".//%s[text()=\"%s\"]/.." %(os.environ["KEY"], os.environ["VAL"]))[0], pretty_print=True)')
    (export KEY=vm_uuid VAL=a607ec69-95e9-4f8a-9d29-f6632e66fd76; curl -s -q http://localhost:8085/Snh_ItfReq? | python -c 'import sys, os;from lxml import etree as et;s=sys.stdin.read();root=et.fromstring(s); print et.tostring(root.xpath(".//%s[text()=\"%s\"]/.." %(os.environ["KEY"], os.environ["VAL"]))[0], pretty_print=True)')
  • Vim function to pretty print large XML. Put following in your .vimrc and type \x.
" XML formatter
function! DoFormatXML() range
        " Save the file type
        let l:origft = &ft 

        " Clean the file type
        set ft= 

        " Add fake initial tag (so we can process multiple top-level elements)
        exe ":let l:beforeFirstLine=" . a:firstline . "-1"
        if l:beforeFirstLine < 0 
                let l:beforeFirstLine=0
        endif
        exe a:lastline . "put ='</PrettyXML>'"
        exe l:beforeFirstLine . "put ='<PrettyXML>'"
        exe ":let l:newLastLine=" . a:lastline . "+2"
        if l:newLastLine > line('$')
                let l:newLastLine=line('$')
        endif

        " Remove XML header
        exe ":" . a:firstline . "," . a:lastline . "s/<\?xml\\_.*\?>\\_s*//e"

        " Recalculate last line of the edited code
        let l:newLastLine=search('</PrettyXML>')

        " Execute external formatter
        exe ":silent " . a:firstline . "," . l:newLastLine . "!xmllint --noblanks --format --recover -"

        " Recalculate first and last lines of the edited code
        let l:newFirstLine=search('<PrettyXML>')
        let l:newLastLine=search('</PrettyXML>')
    
        " Get inner range
        let l:innerFirstLine=l:newFirstLine+1
        let l:innerLastLine=l:newLastLine-1

        " Remove extra unnecessary indentation
        exe ":silent " . l:innerFirstLine . "," . l:innerLastLine "s/^  //e"

        " Remove fake tag
        exe l:newLastLine . "d" 
        exe l:newFirstLine . "d" 

        " Put the cursor at the first line of the edited code
        exe ":" . l:newFirstLine

        " Restore the file type
        exe "set ft=" . l:origft
endfunction
command! -range=% FormatXML <line1>,<line2>call DoFormatXML()

nmap <silent> <leader>x :%FormatXML<CR>
vmap <silent> <leader>x :FormatXML<CR>

VRouter management webpage

You can use access the VRouter management webpage on port 8085

http://localhost:8085/

Here is some useful webpages.

List of VRFs.

http://localhost:8085/Snh_VrfListReq?name=

You can click link in ucindex to see routes

http://localhost:8085/Snh_Inet4UcRouteReq?x=8

Sandesh message stats

http://localhost:8085/Snh_SandeshMessageStatsReq?

Check Cassandra

You can use this script

https://gist.github.com/nati/8064561

ubuntu@contrail-01:~$ python cas.py virtual-network
default-domain:default-project:__link_local__ 3e072e3c-59a9-402e-b61f-3697b81a7274
default-domain:default-project:default-virtual-network 3795cb36-1338-4292-936a-5541fbd06ee6
default-domain:default-project:ip-fabric 8adc0fdd-674f-44cd-ac1b-87854dd0ec87
default-domain:demo:right 6884a3b2-cfbe-4fff-88bb-52ef36146e0e

Discovery Service

Check ip for clients

curl "http://node_ip:5998/clients.json" | python -mjson.tool

Config daemon connection status

  • Api Server

    http://<config-node-ip>:8084/Snh_SandeshUVECacheReq?x=NodeStatus

  • Schema Transformer

    http://<config-node-ip>:8087/Snh_SandeshUVECacheReq?x=NodeStatus

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