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docs(lab4): trace POST /notes, outside-in debug, TLS handshake #1031

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22f92d1
docs: add PR template
markovav-official Jun 4, 2026
68059a5
docs(lab4): trace POST /notes, outside-in debug, TLS handshake
markovav-official Jun 15, 2026
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13 changes: 13 additions & 0 deletions .github/pull_request_template.md
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## Goal
<!-- What does this PR accomplish? 1 sentence. -->

## Changes
-

## Testing
<!-- How did you verify it? -->

## Checklist
- [ ] Title is a clear sentence (≤ 70 chars)
- [ ] Commits are signed (`git log --show-signature`)
- [ ] `submissions/labN.md` updated
2 changes: 2 additions & 0 deletions submissions/attachments/lab4/clienthello-summary.txt
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0x0303 0x1302,0x1303,0x1301,0xc02c,0xc030,0x009f,0xcca9,0xcca8,0xccaa,0xc02b,0xc02f,0x009e,0xc024,0xc028,0x006b,0xc023,0xc027,0x0067,0xc00a,0xc014,0x0039,0xc009,0xc013,0x0033,0x009d,0x009c,0x003d,0x003c,0x0035,0x002f,0x00ff
0x0303 localhost 0x1302,0x1303,0x1301,0xc02c,0xc030,0x009f,0xcca9,0xcca8,0xccaa,0xc02b,0xc02f,0x009e,0xc024,0xc028,0x006b,0xc023,0xc027,0x0067,0xc00a,0xc014,0x0039,0xc009,0xc013,0x0033,0x009d,0x009c,0x003d,0x003c,0x0035,0x002f,0x00ff
566 changes: 566 additions & 0 deletions submissions/attachments/lab4/clienthello.txt
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64 changes: 64 additions & 0 deletions submissions/attachments/lab4/curl-tls.txt
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* Host localhost:8443 was resolved.
* IPv6: ::1
* IPv4: 127.0.0.1
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0* Trying [::1]:8443...
* Connected to localhost (::1) port 8443
* ALPN: curl offers h2,http/1.1
} [5 bytes data]
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
} [512 bytes data]
* TLSv1.3 (IN), TLS handshake, Server hello (2):
{ [122 bytes data]
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
{ [15 bytes data]
* TLSv1.3 (IN), TLS handshake, Certificate (11):
{ [928 bytes data]
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
{ [80 bytes data]
* TLSv1.3 (IN), TLS handshake, Finished (20):
{ [36 bytes data]
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
} [1 bytes data]
* TLSv1.3 (OUT), TLS handshake, Finished (20):
} [36 bytes data]
* SSL connection using TLSv1.3 / TLS_AES_128_GCM_SHA256 / X25519 / id-ecPublicKey
* ALPN: server accepted h2
* Server certificate:
* subject: [NONE]
* start date: Jun 15 08:27:43 2026 GMT
* expire date: Jun 15 20:27:43 2026 GMT
* issuer: CN=Caddy Local Authority - ECC Intermediate
* SSL certificate verify result: unable to get local issuer certificate (20), continuing anyway.
* Certificate level 0: Public key type EC/prime256v1 (256/128 Bits/secBits), signed using ecdsa-with-SHA256
* Certificate level 1: Public key type EC/prime256v1 (256/128 Bits/secBits), signed using ecdsa-with-SHA256
{ [5 bytes data]
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
{ [122 bytes data]
* using HTTP/2
* [HTTP/2] [1] OPENED stream for https://localhost:8443/health
* [HTTP/2] [1] [:method: GET]
* [HTTP/2] [1] [:scheme: https]
* [HTTP/2] [1] [:authority: localhost:8443]
* [HTTP/2] [1] [:path: /health]
* [HTTP/2] [1] [user-agent: curl/8.5.0]
* [HTTP/2] [1] [accept: */*]
} [5 bytes data]
> GET /health HTTP/2
> Host: localhost:8443
> User-Agent: curl/8.5.0
> Accept: */*
>
{ [5 bytes data]
< HTTP/2 200
< alt-svc: h3=":8443"; ma=2592000
< content-type: application/json
< date: Mon, 15 Jun 2026 08:28:28 GMT
< server: Caddy
< content-length: 26
<
{ [26 bytes data]
100 26 100 26 0 0 2417 0 --:--:-- --:--:-- --:--:-- 2600
* Connection #0 to host localhost left intact
{"notes":0,"status":"ok"}
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25 changes: 25 additions & 0 deletions submissions/attachments/lab4/curl-verbose.txt
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Note: Unnecessary use of -X or --request, POST is already inferred.
* Host localhost:8080 was resolved.
* IPv6: ::1
* IPv4: 127.0.0.1
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0* Trying [::1]:8080...
* Connected to localhost (::1) port 8080
> POST /notes HTTP/1.1
> Host: localhost:8080
> User-Agent: curl/8.5.0
> Accept: */*
> Content-Type: application/json
> Content-Length: 39
>
} [39 bytes data]
< HTTP/1.1 201 Created
< Content-Type: application/json
< Date: Mon, 15 Jun 2026 08:26:23 GMT
< Content-Length: 93
<
{ [93 bytes data]
100 132 100 93 100 39 43336 18173 --:--:-- --:--:-- --:--:-- 66000
* Connection #0 to host localhost left intact
{"id":5,"title":"trace me","body":"in flight","created_at":"2026-06-15T08:26:23.202595101Z"}
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18 changes: 18 additions & 0 deletions submissions/attachments/lab4/debug-commands.txt
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### 1. ss -tlnp | grep :8080
LISTEN 0 4096 *:8080 *:* users:(("quicknotes",pid=67371,fd=3))

### 2. ip route show
default via 10.93.24.1 dev eth0 proto static
10.93.24.0/22 dev eth0 proto kernel scope link src 10.93.26.172

### 3. mtr -rwc 5 localhost
Start: 2026-06-15T11:26:25+0300
HOST: capstone55 Loss% Snt Last Avg Best Wrst StDev
1.|-- localhost 0.0% 5 0.1 0.1 0.1 0.1 0.0

### 4. dig +short example.com @1.1.1.1
8.47.69.0
8.6.112.0

### 5. journalctl --user -u quicknotes -n 20 || true
-- No entries --
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125 changes: 125 additions & 0 deletions submissions/attachments/lab4/lab4-tls.txt
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reading from file /root/lab4-work/DevOps-Intro/submissions/attachments/lab4/lab4-tls.pcap, link-type LINUX_SLL2 (Linux cooked v2), snapshot length 262144
Warning: interface names might be incorrect
11:28:28.301421 lo In IP 127.0.0.1.44152 > 127.0.0.1.8443: Flags [S], seq 2157974, win 65495, options [mss 65495,sackOK,TS val 3708445151 ecr 0,nop,wscale 7], length 0
E..<..@.@............x .. ...........0.........
.
a.........
11:28:28.301445 lo In IP 127.0.0.1.8443 > 127.0.0.1.44152: Flags [S.], seq 834201496, ack 2157975, win 65483, options [mss 65495,sackOK,TS val 3708445151 ecr 3708445151,nop,wscale 7], length 0
E..<..@.@.<......... ..x1.... .......0.........
.
a..
a.....
11:28:28.301465 lo In IP 127.0.0.1.44152 > 127.0.0.1.8443: Flags [.], ack 1, win 512, options [nop,nop,TS val 3708445151 ecr 3708445151], length 0
E..4..@.@............x .. ..1........(.....
.
a..
a.
11:28:28.305818 lo In IP 127.0.0.1.44152 > 127.0.0.1.8443: Flags [P.], seq 1:518, ack 1, win 512, options [nop,nop,TS val 3708445155 ecr 3708445151], length 517
E..9..@.@............x .. ..1..............
.
a..
a.................(n..{N>.M./.+ $.P#...vk.... .....1..7....}$. l.eF..y.^od.....>.......,.0.........+./...$.(.k.#.'.g.
...9. ...3.....=.<.5./.....u.........
...............................h2.http/1.1.........1.....*.(........... .
...........................+........-.....3.&.$... .....x~&>... VtY.....;.=.7....av..............................................................................................................................................................................................................
11:28:28.305843 lo In IP 127.0.0.1.8443 > 127.0.0.1.44152: Flags [.], ack 518, win 508, options [nop,nop,TS val 3708445155 ecr 3708445155], length 0
E..4.X@.@.ti........ ..x1.... .......(.....
.
a..
a.
11:28:28.306505 lo In IP 127.0.0.1.8443 > 127.0.0.1.44152: Flags [P.], seq 1:8, ack 518, win 512, options [nop,nop,TS val 3708445156 ecr 3708445155], length 7
E..;.Y@.@.ta........ ..x1.... ......./.....
.
a..
a.......P
11:28:28.306534 lo In IP 127.0.0.1.44152 > 127.0.0.1.8443: Flags [.], ack 8, win 512, options [nop,nop,TS val 3708445156 ecr 3708445156], length 0
E..4..@.@............x .. ..1........(.....
.
a..
a.
11:28:28.306601 lo In IP 127.0.0.1.8443 > 127.0.0.1.44152: Flags [F.], seq 8, ack 518, win 512, options [nop,nop,TS val 3708445156 ecr 3708445156], length 0
E..4.Z@.@.tg........ ..x1.... .......(.....
.
a..
a.
11:28:28.306829 lo In IP 127.0.0.1.44152 > 127.0.0.1.8443: Flags [F.], seq 518, ack 9, win 512, options [nop,nop,TS val 3708445156 ecr 3708445156], length 0
E..4..@.@............x .. ..1........(.....
.
a..
a.
11:28:28.306857 lo In IP 127.0.0.1.8443 > 127.0.0.1.44152: Flags [.], ack 519, win 512, options [nop,nop,TS val 3708445156 ecr 3708445156], length 0
E..4.[@.@.tf........ ..x1.... .......(.....
.
a..
a.
11:28:28.319581 lo In IP6 ::1.49408 > ::1.8443: Flags [S], seq 1663730630, win 65476, options [mss 65476,sackOK,TS val 392863704 ecr 0,nop,wscale 7], length 0
`..F.(.@.................................. .c*...........0.........
.j..........
11:28:28.319600 lo In IP6 ::1.8443 > ::1.49408: Flags [S.], seq 813048788, ack 1663730631, win 65464, options [mss 65476,sackOK,TS val 392863704 ecr 392863704,nop,wscale 7], length 0
`..b.(.@................................ ...0v#.c*.......0.........
.j...j......
11:28:28.319614 lo In IP6 ::1.49408 > ::1.8443: Flags [.], ack 1, win 512, options [nop,nop,TS val 392863704 ecr 392863704], length 0
`..F. .@.................................. .c*..0v#......(.....
.j...j..
11:28:28.323420 lo In IP6 ::1.49408 > ::1.8443: Flags [P.], seq 1:518, ack 1, win 512, options [nop,nop,TS val 392863708 ecr 392863704], length 517
`..F.%.@.................................. .c*..0v#......-.....
.j...j................./.p.....DB
......z.f.R..mp!. ......3Q..n.......=...:...-......>.......,.0.........+./...$.(.k.#.'.g.
...9. ...3.....=.<.5./.....u........ localhost.........
...............................h2.http/1.1.........1.....*.(........... .
...........................+........-.....3.&.$... . .Y]...*I...g~.7._..1.v..P....x............................................................................................................................................................................................
11:28:28.323443 lo In IP6 ::1.8443 > ::1.49408: Flags [.], ack 518, win 508, options [nop,nop,TS val 392863708 ecr 392863708], length 0
`..b. .@................................ ...0v#.c*.......(.....
.j...j..
11:28:28.324248 lo In IP6 ::1.8443 > ::1.49408: Flags [P.], seq 1:1425, ack 518, win 512, options [nop,nop,TS val 392863708 ecr 392863708], length 1424
`..b...@................................ ...0v#.c*.............
.j...j......z...v...S>89..z...A..;.X.(... %...V.<.u ......3Q..n.......=...:...-...........+.....3.$... m.T ...ER.O..5o..L^.s#...E....KM.......... .qR...2=.K-F...k.c4......36....C......b..Ce.7M.\\..p@.8}.....T..B.~.gNll"....Yh...^........../$...<8RV+.F.. Q.P..r..!..t..a..............x.^..&.].4...=.K._5.e.....)..5.q6./_.7...sv..j9.../....&....L.X.c.M....-..RJ.#.xl./=-..Z.......:lV.Oc..f`4..(4Z.....;.l...........~.a.-:..
D.._?..&...y.X2..o..n.......h.V.q..`.@.r`X..*H..a.3I.Y.........'#.9.[B.o...l{.s...b-....s..=.X..nO...p....y..^..Vzm..v..uO...2d<.._......!.\\..:I3#.............M.....%RS..hm.;|....z.D.....{[v..........l...i.A......9q\30.@<.......KJ4.}49$G.".L.).M.g...s..>u..;...#w.>...4.L.W.T..8O.....vU.>.V... ..".$.U...x.|l......*djg.z.....V....;D.}.A.k.~.n,B.]...ep/l.....R.........8a...n.85.m".V.Ud.7m....>L@.#.......Y.|.b
.....%?.....Gv=....!..qd.DF7.H.....W=i...".{..._3$D.........SJS..}.:..Ot...seD...>.$..7... ..`d. .d.....2......n..7S.P.n.2R2.x.u.....(..M....)u..I...W1WK..DZ.....v8....3"W.......
j['....&}......r9!.0!.!&|..].7c(...K).r...h..i|.......R........ .......|.=.@...W..y>N...M..vA..=,..r.....p.<.~ .*g......a*.~..46E..H.p... .s..P.".M#..M~..Y.._HIR.7..c.W.^....S$..9..w.\.^.=......U%.g..;*.I..1..b..`....D....5`=....A..T..^.....O6\8.......i...(w...ty.(tB..3...."......dt.3...{_.=..LrXK'M.8........+_..{..i.L.....3.d=S/.;w..f/...<.....X.hjH ...e...r...x..}....~..4Q.GHv...1.`..t.>....^......S.G...VEF.&....L.
11:28:28.324293 lo In IP6 ::1.49408 > ::1.8443: Flags [.], ack 1425, win 617, options [nop,nop,TS val 392863708 ecr 392863708], length 0
`..F. .@.................................. .c*..0v)e...i.(.....
.j...j..
11:28:28.327012 lo In IP6 ::1.49408 > ::1.8443: Flags [P.], seq 518:582, ack 1425, win 617, options [nop,nop,TS val 392863711 ecr 392863708], length 64
`..F.`.@.................................. .c*..0v)e...i.h.....
.j...j............5...F.5..S..n...a.R.....\...........Z[`..|{.......[...
11:28:28.327347 lo In IP6 ::1.8443 > ::1.49408: Flags [P.], seq 1425:1486, ack 582, win 512, options [nop,nop,TS val 392863712 ecr 392863711], length 61
`..b.].@................................ ...0v)ec*.......e.....
.j...j......8g.....5.........j_.\|......E......\.*.....dP...zd.{R....
11:28:28.327474 lo In IP6 ::1.49408 > ::1.8443: Flags [P.], seq 582:677, ack 1486, win 617, options [nop,nop,TS val 392863712 ecr 392863712], length 95
`..F...@.................................. .c*..0v)....i.......
.j...j......Zm6.A....L..0)r/O.......!.4+......C/d..u.H....B.u..J..z.'55.q._........N.@D...V.!...*..ZS..
11:28:28.327629 lo In IP6 ::1.49408 > ::1.8443: Flags [P.], seq 677:747, ack 1486, win 617, options [nop,nop,TS val 392863712 ecr 392863712], length 70
`..F.f.@.................................. .c*.k0v)....i.n.....
.j...j......A..< ....n..x....].D.....L....B..6....M..D.U..WY.....!8t.....%../.
11:28:28.327671 lo In IP6 ::1.8443 > ::1.49408: Flags [P.], seq 1486:1521, ack 677, win 512, options [nop,nop,TS val 392863712 ecr 392863712], length 35
`..b.C.@................................ ...0v).c*.k.....K.....
.j...j..........{6.'lt...|..,$..@..F>..>..(
11:28:28.328882 lo In IP6 ::1.8443 > ::1.49408: Flags [P.], seq 1521:1552, ack 747, win 512, options [nop,nop,TS val 392863713 ecr 392863712], length 31
`..b.?.@................................ ...0v).c*.......G.....
.j...j.......9]......... o.X.....s6.R7.
11:28:28.328948 lo In IP6 ::1.49408 > ::1.8443: Flags [.], ack 1552, win 617, options [nop,nop,TS val 392863713 ecr 392863712], length 0
`..F. .@.................................. .c*..0v)....i.(.....
.j...j..
11:28:28.329600 lo In IP6 ::1.8443 > ::1.49408: Flags [P.], seq 1552:1657, ack 747, win 512, options [nop,nop,TS val 392863714 ecr 392863713], length 105
`..b...@................................ ...0v).c*.............
.j...j......d......5..S...Yj...}QB.\%..Af..z.+..b..........J..........pr..e....\=.D.@..v.u.......F..I#...q....S.P
11:28:28.329651 lo In IP6 ::1.8443 > ::1.49408: Flags [P.], seq 1657:1714, ack 747, win 512, options [nop,nop,TS val 392863714 ecr 392863713], length 57
`..b.Y.@................................ ...0v*Mc*.......a.....
.j...j......4...U.ufz\`.f.4.<..2...x..i....R.N...J...<M..".x...
]
11:28:28.329699 lo In IP6 ::1.49408 > ::1.8443: Flags [.], ack 1714, win 617, options [nop,nop,TS val 392863714 ecr 392863714], length 0
`..F. .@.................................. .c*..0v*....i.(.....
.j...j..
11:28:28.329999 lo In IP6 ::1.49408 > ::1.8443: Flags [P.], seq 747:771, ack 1714, win 617, options [nop,nop,TS val 392863714 ecr 392863714], length 24
`..F.8.@.................................. .c*..0v*....i.@.....
.j...j..........(/wY .F/YD.M.q>.
11:28:28.330056 lo In IP6 ::1.49408 > ::1.8443: Flags [F.], seq 771, ack 1714, win 617, options [nop,nop,TS val 392863714 ecr 392863714], length 0
`..F. .@.................................. .c*..0v*....i.(.....
.j...j..
11:28:28.330118 lo In IP6 ::1.8443 > ::1.49408: Flags [P.], seq 1714:1738, ack 772, win 512, options [nop,nop,TS val 392863714 ecr 392863714], length 24
`..b.8.@................................ ...0v*.c*.......@.....
.j...j............D......u
D...R
11:28:28.330136 lo In IP6 ::1.49408 > ::1.8443: Flags [R], seq 1663731402, win 0, length 0
`..F...@.................................. .c*......P.......
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44 changes: 44 additions & 0 deletions submissions/attachments/lab4/lab4-trace.txt
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reading from file /root/lab4-work/DevOps-Intro/submissions/attachments/lab4/lab4-trace.pcap, link-type EN10MB (Ethernet), snapshot length 262144
11:26:23.201919 IP6 ::1.54280 > ::1.8080: Flags [S], seq 603843237, win 65476, options [mss 65476,sackOK,TS val 392738586 ecr 0,nop,wscale 7], length 0
` ul.(.@....................................#............0.........
.h..........
11:26:23.201946 IP6 ::1.8080 > ::1.54280: Flags [S.], seq 3905677142, ack 603843238, win 65464, options [mss 65476,sackOK,TS val 392738586 ecr 392738586,nop,wscale 7], length 0
`.R..(.@.......................................V#........0.........
.h...h......
11:26:23.201968 IP6 ::1.54280 > ::1.8080: Flags [.], ack 1, win 512, options [nop,nop,TS val 392738586 ecr 392738586], length 0
` ul. .@....................................#......W.....(.....
.h...h..
11:26:23.202182 IP6 ::1.54280 > ::1.8080: Flags [P.], seq 1:175, ack 1, win 512, options [nop,nop,TS val 392738586 ecr 392738586], length 174: HTTP: POST /notes HTTP/1.1
` ul...@....................................#......W...........
.h...h..POST /notes HTTP/1.1
Host: localhost:8080
User-Agent: curl/8.5.0
Accept: */*
Content-Type: application/json
Content-Length: 39

{"title":"trace me","body":"in flight"}
11:26:23.202197 IP6 ::1.8080 > ::1.54280: Flags [.], ack 175, win 511, options [nop,nop,TS val 392738586 ecr 392738586], length 0
`.R.. .@.......................................W#..T.....(.....
.h...h..
11:26:23.203056 IP6 ::1.8080 > ::1.54280: Flags [P.], seq 1:207, ack 175, win 512, options [nop,nop,TS val 392738587 ecr 392738586], length 206: HTTP: HTTP/1.1 201 Created
`.R....@.......................................W#..T...........
.h...h..HTTP/1.1 201 Created
Content-Type: application/json
Date: Mon, 15 Jun 2026 08:26:23 GMT
Content-Length: 93

{"id":5,"title":"trace me","body":"in flight","created_at":"2026-06-15T08:26:23.202595101Z"}

11:26:23.203084 IP6 ::1.54280 > ::1.8080: Flags [.], ack 207, win 511, options [nop,nop,TS val 392738587 ecr 392738587], length 0
` ul. .@....................................#..T...%.....(.....
.h...h..
11:26:23.203444 IP6 ::1.54280 > ::1.8080: Flags [F.], seq 175, ack 207, win 512, options [nop,nop,TS val 392738588 ecr 392738587], length 0
` ul. .@....................................#..T...%.....(.....
.h...h..
11:26:23.204491 IP6 ::1.8080 > ::1.54280: Flags [F.], seq 207, ack 176, win 512, options [nop,nop,TS val 392738589 ecr 392738588], length 0
`.R.. .@.......................................%#..U.....(.....
.h...h..
11:26:23.204535 IP6 ::1.54280 > ::1.8080: Flags [.], ack 208, win 512, options [nop,nop,TS val 392738589 ecr 392738589], length 0
` ul. .@....................................#..U...&.....(.....
.h...h..
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