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Azure Linux App Service Network Test Tools

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renhanli edited this page Dec 29, 2020 · 4 revisions

Azure Linux App Service Network Test Tools

TCP ping test

  1. Install tcpping tool:

    • Debian Linux:

      # apt update
# apt install tcptraceroute
# wget http://www.vdberg.org/~richard/tcpping -O /usr/bin/tcpping
# chmod 755 /usr/bin/tcpping

    • Alpine Linux:

      # apk update
# apk add tcptraceroute
# wget http://www.vdberg.org/~richard/tcpping -O /usr/bin/tcpping
# chmod 755 /usr/bin/tcpping

  2. Usage

tcpping [-d] [-c] [-C] [-w sec] [-q num] [-x count] ipaddress/url [port]
    -d   print timestamp before every result
    -c   print a columned result line
    -C   print in the same format as fping's -C option
    -w   wait time in seconds (defaults to 3)
    -r   repeat every n seconds (defaults to 1)
    -x   repeat n times (defaults to unlimited)
  1. Example
# tcpping -d -x 5 www.google.com 443

Mon Dec 28 05:40:50 UTC 2020
seq 0: tcp response from hkg12s18-in-f4.1e100.net (172.217.163.228) [open]  2.270 ms
Mon Dec 28 05:40:51 UTC 2020
seq 1: tcp response from hkg12s11-in-f4.1e100.net (216.58.200.4) [open]  2.166 ms
Mon Dec 28 05:40:52 UTC 2020
seq 2: tcp response from hkg07s34-in-f4.1e100.net (172.217.174.196) [open]  1.708 ms
Mon Dec 28 05:40:53 UTC 2020
seq 3: tcp response from hkg12s18-in-f4.1e100.net (172.217.163.228) [open]  2.162 ms
Mon Dec 28 05:40:54 UTC 2020
seq 4: tcp response from hkg07s37-in-f4.1e100.net (142.250.199.68) [open]  1.436 ms

TCP dump

  1. Install TCP dump

    • Debian Linux:

      # apt update
# apt install tcpdump

    • Alpine Linux:

      # apk update
# apk add tcpdump

  2. Usage

tcpdump [-aAbdDefhHIJKlLnNOpqStuUvxX#] [ -B size ] [ -c count ]
        [ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]
        [ -i interface ] [ -j tstamptype ] [ -M secret ] [ --number ]
        [ -Q in|out|inout ]
        [ -r file ] [ -s snaplen ] [ --time-stamp-precision precision ]
        [ --immediate-mode ] [ -T type ] [ --version ] [ -V file ]
        [ -w file ] [ -W filecount ] [ -y datalinktype ] [ -z postrotate-command ]
        [ -Z user ] [ expression ]
  1. Example

  • Display all traffic to or from an IP address

    # tcpdump -s0 host 204.79.197.200

  • Display all HTTPS traffic to or from a host name over eth0

    # tcpdump -ni eth0 host bing.com and tcp port 443

  • Capture TCP dump and write to .pcap file

    # tcpdump -ni eth0 -w /home/dump01.pcap host bing.com

  • Rotate TCP dump to multiple files

    # tcpdump -w /home/tcp.pcap -s0 -C 1 -W 5
-w: write to file
-s0:save the whole packet
-C: swith to next file when size bigger then xMB
-W: generate x files

DNS test

  1. Install "dig"

    • Debian Linux:

      # apt install dnsutils

    • Alping Linux:

      # apk add bind-tools

  2. Usage

    dig [@global-server] [domain] [q-type] [q-class] {q-opt}
            {global-d-opt} host [@local-server] {local-d-opt}
            [ host [@local-server] {local-d-opt} [...]]

  3. Examples

    • Display host IP mapping in short form of answer

      # dig cnn.com +short
151.101.129.67
151.101.1.67
151.101.65.67
151.101.193.67

    • Display detailed DNS mapping report

      # dig cnn.com

; <<>> DiG 9.10.3-P4-Debian <<>> cnn.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 34223
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1280
;; QUESTION SECTION:
;cnn.com.                       IN      A

;; ANSWER SECTION:
cnn.com.                60      IN      A       151.101.193.67
cnn.com.                60      IN      A       151.101.1.67
cnn.com.                60      IN      A       151.101.65.67
cnn.com.                60      IN      A       151.101.129.67

;; Query time: 5 msec
;; SERVER: 127.0.0.11#53(127.0.0.11)
;; WHEN: Tue Dec 29 02:36:28 UTC 2020
;; MSG SIZE  rcvd: 100

    • dig record with your specified DNS server

      # dig @8.8.8.8 cnn.com

; <<>> DiG 9.10.3-P4-Debian <<>> @8.8.8.8 cnn.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 58364
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;cnn.com.                       IN      A

;; ANSWER SECTION:
cnn.com.                38      IN      A       151.101.129.67
cnn.com.                38      IN      A       151.101.193.67
cnn.com.                38      IN      A       151.101.1.67
cnn.com.                38      IN      A       151.101.65.67

;; Query time: 3 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Tue Dec 29 02:37:51 UTC 2020
;; MSG SIZE  rcvd: 100

FAQs

  • How to check the Linux distribution of your Docker container?

    Check /etc/os-release

    Examples:

    # cat /etc/os-release

  PRETTY_NAME="Debian GNU/Linux 9 (stretch)"
  NAME="Debian GNU/Linux"
  VERSION_ID="9"
  VERSION="9 (stretch)"
  VERSION_CODENAME=stretch
  ID=debian
  HOME_URL="https://www.debian.org/"
  SUPPORT_URL="https://www.debian.org/support"
  BUG_REPORT_URL="https://bugs.debian.org/"
    # cat /etc/os-release
NAME="Alpine Linux"
ID=alpine
VERSION_ID=3.11.2
PRETTY_NAME="Alpine Linux v3.11"
HOME_URL="https://alpinelinux.org/"
BUG_REPORT_URL="https://bugs.alpinelinux.org/"
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