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Drop TTL 300 → 180 seconds

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I want the key-value changes to propagate faster, so I dropped the TTL.
Now, on average, it'll take on average 90 seconds for a stale value to
clear out, 3 minutes max.

I don't think this will affect traffic much; I suspect that there's not
much negative-caching going on (based on the queries I see), and the
lion's share of queries (I believe over 3/4 of my traffic are things I
don't have a record for). And I average ~5
queries-with-a-record-returned per second on ns-aws, which means that'll
bump to a little more than 8 queries a second.
This commit is contained in:
Brian Cunnie
2022-01-19 07:15:15 -08:00
parent bf4f039001
commit 8155b0821e
2 changed files with 16 additions and 14 deletions
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22
bosh-release/src/sslip.io-dns-server/integration_test.go
View File

@@ -59,7 +59,7 @@ var _ = Describe("sslip.io-dns-server", func() {
Entry("A (or lack thereof) for example.com",
"@localhost example.com +short",
`\A\z`,
`TypeA example.com. \? nil, SOA example.com. briancunnie.gmail.com. 2021123100 900 900 1800 300\n$`),
`TypeA example.com. \? nil, SOA example.com. briancunnie.gmail.com. 2022011900 900 900 1800 180\n$`),
Entry("A for www-127-0-0-1.sslip.io",
"@localhost www-127-0-0-1.sslip.io +short",
`\A127.0.0.1\n\z`,
@@ -75,7 +75,7 @@ var _ = Describe("sslip.io-dns-server", func() {
Entry("AAAA not found for example.com",
"@localhost example.com aaaa +short",
`\A\z`,
`TypeAAAA example.com. \? nil, SOA example.com. briancunnie.gmail.com. 2021123100 900 900 1800 300\n$`),
`TypeAAAA example.com. \? nil, SOA example.com. briancunnie.gmail.com. 2022011900 900 900 1800 180\n$`),
Entry("AAAA for www-2601-646-100-69f0-1c09-bae7-aa42-146c.sslip.io",
"@localhost www-2601-646-100-69f0-1c09-bae7-aa42-146c.sslip.io aaaa +short",
`\A2601:646:100:69f0:1c09:bae7:aa42:146c\n\z`,
@@ -92,23 +92,23 @@ var _ = Describe("sslip.io-dns-server", func() {
Entry("CNAME not found for example.com",
"@localhost example.com cname +short",
`\A\z`,
`TypeCNAME example.com. \? nil, SOA example.com. briancunnie.gmail.com. 2021123100 900 900 1800 300\n$`),
`TypeCNAME example.com. \? nil, SOA example.com. briancunnie.gmail.com. 2022011900 900 900 1800 180\n$`),
Entry("MX for example.com",
"@localhost example.com mx +short",
`\A0 example.com.\n\z`,
`TypeMX example.com. \? 0 example.com.\n$`),
Entry("SOA for sslip.io",
"@localhost sslip.io soa +short",
`\Asslip.io. briancunnie.gmail.com. 2021123100 900 900 1800 300\n\z`,
`TypeSOA sslip.io. \? sslip.io. briancunnie.gmail.com. 2021123100 900 900 1800 300\n$`),
`\Asslip.io. briancunnie.gmail.com. 2022011900 900 900 1800 180\n\z`,
`TypeSOA sslip.io. \? sslip.io. briancunnie.gmail.com. 2022011900 900 900 1800 180\n$`),
Entry("SOA for example.com",
"@localhost example.com soa +short",
`\Aexample.com. briancunnie.gmail.com. 2021123100 900 900 1800 300\n\z`,
`TypeSOA example.com. \? example.com. briancunnie.gmail.com. 2021123100 900 900 1800 300\n$`),
`\Aexample.com. briancunnie.gmail.com. 2022011900 900 900 1800 180\n\z`,
`TypeSOA example.com. \? example.com. briancunnie.gmail.com. 2022011900 900 900 1800 180\n$`),
Entry("SRV (or other record that we don't implement) for example.com",
"@localhost example.com srv +short",
`\A\z`,
`TypeSRV example.com. \? nil, SOA example.com. briancunnie.gmail.com. 2021123100 900 900 1800 300\n$`),
`TypeSRV example.com. \? nil, SOA example.com. briancunnie.gmail.com. 2022011900 900 900 1800 180\n$`),
Entry(`TXT for version.status.sslip.io is the version number of the xip software (which gets overwritten during linking)`,
"@127.0.0.1 version.status.sslip.io txt +short",
`\A"dev"\n"today"\n"xxx"\n\z`,
@@ -120,11 +120,11 @@ var _ = Describe("sslip.io-dns-server", func() {
Entry(`TXT is the querier's IPv4 address and the domain is NOT "ip.sslip.io"`,
"@127.0.0.1 example.com txt +short",
`\A\z`,
`TypeTXT example.com. \? nil, SOA example.com. briancunnie.gmail.com. 2021123100 900 900 1800 300\n$`),
`TypeTXT example.com. \? nil, SOA example.com. briancunnie.gmail.com. 2022011900 900 900 1800 180\n$`),
Entry(`getting a non-existent value: TXT for my-key.k-v.io"`,
"@127.0.0.1 my-key.k-v.io txt +short",
`\A\z`,
`TypeTXT my-key.k-v.io. \? nil, SOA my-key.k-v.io. briancunnie.gmail.com. 2021123100 900 900 1800 300\n$`),
`TypeTXT my-key.k-v.io. \? nil, SOA my-key.k-v.io. briancunnie.gmail.com. 2022011900 900 900 1800 180\n$`),
Entry(`putting a value: TXT for put.MyValue.MY-KEY.k-v.io"`,
"@127.0.0.1 put.MyValue.MY-KEY.k-v.io txt +short",
`"MyValue"`,
@@ -140,7 +140,7 @@ var _ = Describe("sslip.io-dns-server", func() {
Entry(`getting a non-existent value: TXT for my-key.k-v.io"`,
"@127.0.0.1 my-key.k-v.io txt +short",
`\A\z`,
`TypeTXT my-key.k-v.io. \? nil, SOA my-key.k-v.io. briancunnie.gmail.com. 2021123100 900 900 1800 300\n$`),
`TypeTXT my-key.k-v.io. \? nil, SOA my-key.k-v.io. briancunnie.gmail.com. 2022011900 900 900 1800 180\n$`),
)
})
Describe("for more complex assertions", func() {

8
bosh-release/src/sslip.io-dns-server/xip/xip.go
View File

@@ -755,12 +755,14 @@ func SOAResource(name dnsmessage.Name) dnsmessage.SOAResource {
return dnsmessage.SOAResource{
NS: name,
MBox: mbox,
Serial: 2021123100,
// cribbed the Refresh/Retry/Expire from google.com
Serial: 2022011900,
// cribbed the Refresh/Retry/Expire from google.com.
// MinTTL was 300, but I dropped to 180 for faster
// key-value propagation
Refresh: 900,
Retry: 900,
Expire: 1800,
MinTTL: 300,
MinTTL: 180,
}
}