ç§ãã¡ã¯ Apache Cassandra ããŒã¿ããŒã¹ãšãããã Kubernetes ããŒã¹ã®ã€ã³ãã©ã¹ãã©ã¯ãã£å
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èŠæ§ã«é »ç¹ã«ééããŸãã ãã®è³æã§ã¯ãCassandra ã K8s ã«ç§»è¡ããããã«å¿
èŠãªæé ãåºæºãããã³æ¢åã®ãœãªã¥ãŒã·ã§ã³ (ãªãã¬ãŒã¿ãŒã®æŠèŠãå«ã) ã«é¢ããããžã§ã³ãå
±æããŸãã
ã女æ§ã統治ã§ããè ã¯åœå®¶ã統治ã§ããã
ã«ãµã³ãã©ã£ãŠèª°ïŒ ããã¯ãåäžé害ç¹ã®ãªãé«å¯çšæ§ã確ä¿ããªããã倧éã®ããŒã¿ã管çããããã«èšèšãããåæ£ã¹ãã¬ãŒãž ã·ã¹ãã ã§ãã ãã®ãããžã§ã¯ãã«ã€ããŠé·ã玹ä»ã¯ã»ãšãã©å¿ èŠãªãã®ã§ãç¹å®ã®èšäºã®æèã«é¢é£ãã Cassandra ã®äž»ãªæ©èœã®ã¿ã説æããŸãã
- Cassandra 㯠Java ã§æžãããŠããŸãã
- Cassandra ããããžã«ã¯ãããã€ãã®ã¬ãã«ãå«ãŸããŠããŸãã
- ããŒã - ãããã€ããã Cassandra ã€ã³ã¹ã¿ã³ã¹ XNUMX ã€ã
- ã©ãã¯ã¯ãåãããŒã¿ã»ã³ã¿ãŒå ã«ãããäœããã®ç¹æ§ã«ãã£ãŠçµåããã Cassandra ã€ã³ã¹ã¿ã³ã¹ã®ã°ã«ãŒãã§ãã
- ããŒã¿ã»ã³ã¿ãŒ - XNUMX ã€ã®ããŒã¿ã»ã³ã¿ãŒã«ãã Cassandra ã€ã³ã¹ã¿ã³ã¹ã®ãã¹ãŠã®ã°ã«ãŒãã®ã³ã¬ã¯ã·ã§ã³ã
- ã¯ã©ã¹ã¿ãŒã¯ãã¹ãŠã®ããŒã¿ã»ã³ã¿ãŒã®éåã§ãã
- Cassandra 㯠IP ã¢ãã¬ã¹ã䜿çšããŠããŒããèå¥ããŸãã
- æžã蟌ã¿ããã³èªã¿åãæäœãé«éåããããã«ãCassandra ã¯ããŒã¿ã®äžéšã RAM ã«ä¿åããŸãã
ããŠãå®éã« Kubernetes ã«ç§»è¡ããå¯èœæ§ããããŸãã
移管æã®ãã§ãã¯ãªã¹ã
Cassandra ã® Kubernetes ãžã®ç§»è¡ã«ã€ããŠèšãã°ã移è¡ã«ãã£ãŠç®¡çããã䟿å©ã«ãªãããšãæåŸ ããŠããŸãã ãã®ããã«ã¯äœãå¿ èŠã§ãäœã圹ç«ã€ã®ã§ããããïŒ
1. ããŒã¿ã¹ãã¬ãŒãž
ãã§ã«æããã«ãªã£ãããã«ãCassanda ã¯ããŒã¿ã®äžéšã RAM ã«ä¿åããŸãã ã¡ã ããŒãã«ã ãã ããããŒã¿ã®å¥ã®éšåããã£ã¹ã¯ã«ä¿åãããŸãã SSTããŒãã«ã ãã®ããŒã¿ã«ãšã³ãã£ãã£ãè¿œå ãããŸã ã³ããããã° â ãã¹ãŠã®ãã©ã³ã¶ã¯ã·ã§ã³ã®èšé²ããã£ã¹ã¯ã«ãä¿åãããŸãã
Cassandra ã§ãã©ã³ã¶ã¯ã·ã§ã³ ãã€ã¢ã°ã©ã ãäœæãã
Kubernetes ã§ã¯ãPersistentVolume ã䜿çšããŠããŒã¿ãä¿åã§ããŸãã å®èšŒæžã¿ã®ã¡ã«ããºã ã®ãããã§ãKubernetes ã§ã®ããŒã¿ã®æäœã¯å¹Žã ç°¡åã«ãªã£ãŠããŠããŸãã
ç¬èªã® PersistentVolume ãå Cassandra ãããã«å²ãåœãŠãŸãã
Cassandra èªäœãããŒã¿ ã¬ããªã±ãŒã·ã§ã³ãæ瀺ããŠããããã®ããã®çµã¿èŸŒã¿ã¡ã«ããºã ãæäŸããŠããããšã«æ³šæããããšãéèŠã§ãã ãããã£ãŠãå€æ°ã®ããŒããã Cassandra ã¯ã©ã¹ã¿ãŒãæ§ç¯ããŠããå Žåã¯ãããŒã¿ ã¹ãã¬ãŒãžã« Ceph ã GlusterFS ãªã©ã®åæ£ã·ã¹ãã ã䜿çšããå¿
èŠã¯ãããŸããã ãã®å Žåã次ã䜿çšããŠãã¹ã ãã£ã¹ã¯ã«ããŒã¿ãä¿åããã®ãè«ççã§ãã hostPath
.
ãã XNUMX ã€ã®è³ªåã¯ãæ©èœãã©ã³ãããšã«éçºè çšã«å¥åã®ç°å¢ãäœæãããã©ããã§ãã ãã®å Žåãæ£ããã¢ãããŒãã¯ãXNUMX ã€ã® Cassandra ããŒããèµ·åããããŒã¿ãåæ£ã¹ãã¬ãŒãžã«ä¿åããããšã§ãã åè¿°ã® Ceph ãš GlusterFS ãéžæè¢ã«ãªããŸãã ããããã°ãéçºè ã¯ãKuberntes ã¯ã©ã¹ã¿ãŒ ããŒãã® XNUMX ã€ã倱ãããå Žåã§ãããã¹ã ããŒã¿ã倱ãããªãããšã確信ã§ããŸãã
2. ç£èŠ
Kubernetes ã§ã¢ãã¿ãªã³ã°ãå®è£
ããããã®äºå®äžç°è«ã®ãªãéžæè¢ã¯ Prometheus ã§ã (ããã«ã€ããŠã¯ã
Grafana for Cassandra ã§ã®ã°ã©ãã®å€èŠ³ã®äŸ
ãšã¯ã¹ããŒã¿ã¯ XNUMX ã€ã ãã§ãã
ç§ãã¡ãæåã®ãã®ãéžãã çç±ã¯æ¬¡ã®ãšããã§ãã
- JMX Exporter ã¯æé·ããçºå±ããŠããŸãããCassandra Exporter ã¯ã³ãã¥ããã£ããååãªãµããŒããåŸãããšãã§ããŸããã§ããã Cassandra Exporter ã¯ãŸã Cassandra ã®ã»ãšãã©ã®ããŒãžã§ã³ããµããŒãããŠããŸããã
- ãã©ã°ãè¿œå ããããšã§ Javaagent ãšããŠå®è¡ã§ããŸã
-javaagent:<plugin-dir-name>/cassandra-exporter.jar=--listen=:9180
. - 圌ã«äžã€ãããŸã
é©åãªããã·ã¥ããŒã ãCassandra Exporter ãšäºææ§ããããŸããã
3. Kubernetes ããªããã£ãã®éžæ
Cassandra ã¯ã©ã¹ã¿ãŒã®äžèšã®æ§é ã«åŸã£ãŠãããã§èª¬æãããŠãããã¹ãŠã®å 容ã Kubernetes çšèªã«ç¿»èš³ããŠã¿ãŸãããã
- Cassandra ããŒã â ããã
- Cassandra ã©ã㯠â ã¹ããŒããã«ã»ãã
- Cassandra ããŒã¿ã»ã³ã¿ãŒ â StatefulSet ããã®ããŒã«
- ã«ãµã³ãã©ã¯ã©ã¹ã¿ãŒâ???
Cassandra ã¯ã©ã¹ã¿ãŒå
šäœãäžåºŠã«ç®¡çããã«ã¯ãè¿œå ã®ãšã³ãã£ãã£ãäžè¶³ããŠããããšãå€æããŸããã ããããäœããååšããªãå Žåã¯ããããäœæããããšãã§ããŸãã Kubernetes ã«ã¯ããã®ç®çã®ããã«ç¬èªã®ãªãœãŒã¹ãå®çŸ©ããã¡ã«ããºã ããããŸãã
ãã°ãšã¢ã©ãŒãçšã®è¿œå ãªãœãŒã¹ã®å®£èš
ããããã«ã¹ã¿ã ãªãœãŒã¹èªäœã«ã¯äœã®æå³ããããŸãããçµå±ã®ãšãããã«ã¹ã¿ã ãªãœãŒã¹ã«ã¯æ¬¡ã®ããšãå¿
èŠã§ãã ã³ã³ãããŒã©ã å©ããæ±ããå¿
èŠããããããããŸãã
4. ãããã®èå¥
äžã®æ®µèœã§ã¯ãXNUMX ã€ã® Cassandra ããŒãã Kubernetes ã® XNUMX ã€ã®ãããã«çžåœããããšã«åæããŸããã ãã ãããããã® IP ã¢ãã¬ã¹ã¯æ¯åç°ãªããŸãã ãããŠãCassandra ã®ããŒãã®èå¥ã¯ IP ã¢ãã¬ã¹ã«åºã¥ããŠããŸã...ããããåé€ããããã³ã«ãCassandra ã¯ã©ã¹ã¿ãŒã¯æ°ããããŒããè¿œå ããããšãããããŸããã
解決æ¹æ³ã¯ XNUMX ã€ã ãã§ã¯ãããŸããã
- ãã¹ãèå¥å (Cassandra ã€ã³ã¹ã¿ã³ã¹ãäžæã«èå¥ãã UUID) ãŸã㯠IP ã¢ãã¬ã¹ããšã«ã¬ã³ãŒããä¿æããããããã¹ãŠããã€ãã®æ§é /ããŒãã«ã«ä¿åã§ããŸãã ãã®æ¹æ³ã«ã¯ XNUMX ã€ã®äž»ãªæ¬ ç¹ããããŸãã
- XNUMX ã€ã®ããŒããåæã«ããŠã³ãããšç«¶åç¶æ ãçºçãããªã¹ã¯ã äžæåŸãCassandra ããŒãã¯åæã«ããŒãã«ãã IP ã¢ãã¬ã¹ãèŠæ±ããåããªãœãŒã¹ãããã£ãŠç«¶åããŸãã
- Cassandra ããŒãã®ããŒã¿ã倱ããããšããããèå¥ã§ããªããªããŸãã
- XNUMX çªç®ã®è§£æ±ºçã¯å°ããªããã¯ã®ããã«èŠããŸãããããã§ããCassandra ããŒãããšã« ClusterIP ã䜿çšããŠãµãŒãã¹ãäœæã§ããŸãã ãã®å®è£
ã®åé¡ç¹:
- Cassandra ã¯ã©ã¹ã¿ãŒå ã«å€æ°ã®ããŒããããå Žåãå€æ°ã®ãµãŒãã¹ãäœæããå¿ èŠããããŸãã
- ClusterIP æ©èœã¯ iptables çµç±ã§å®è£
ãããŸãã Cassandra ã¯ã©ã¹ã¿ãŒã«å€æ° (1000... ãŸã㯠100?) ã®ããŒããããå Žåããããåé¡ã«ãªãå¯èœæ§ããããŸãã ããã§ã
IPVSã«åºã¥ããã©ã³ã·ã³ã° ãã®åé¡ã解決ã§ããŸãã
- XNUMX çªç®ã®è§£æ±ºçã¯ãèšå®ãæå¹ã«ããŠããããã®å°çšãããã¯ãŒã¯ã®ä»£ããã« Cassandra ããŒãã®ããŒãã®ãããã¯ãŒã¯ã䜿çšããããšã§ãã
hostNetwork: true
ã ãã®æ¹æ³ã«ã¯æ¬¡ã®ãããªå¶éããããŸãã- ãŠãããã亀æããããã æ°ããããŒãã¯åã®ããŒããšåã IP ã¢ãã¬ã¹ãæã€å¿ èŠããããŸã (AWS ã GCP ã®ãããªã¯ã©ãŠãã§ã¯ããããè¡ãã®ã¯ã»ãŒäžå¯èœã§ã)ã
- ã¯ã©ã¹ã¿ãŒ ããŒãã®ãããã¯ãŒã¯ã䜿çšããŠããããã¯ãŒã¯ ãªãœãŒã¹ã®ç«¶åãéå§ããŸãã ãããã£ãŠãCassandra ãå«ãè€æ°ã®ãããã XNUMX ã€ã®ã¯ã©ã¹ã¿ãŒ ããŒãã«é 眮ãããšåé¡ãçºçããŸãã
5. ããã¯ã¢ãã
åäžã® Cassandra ããŒãã®ããŒã¿ã®å®å
šããŒãžã§ã³ãã¹ã±ãžã¥ãŒã«ã«åŸã£ãŠä¿åããããšèããŠããŸãã Kubernetes ã¯ã次ã®ãããªäŸ¿å©ãªæ©èœãæäŸããŸãã
Cassandra ã¯äžéšã®ããŒã¿ãã¡ã¢ãªã«ä¿åããããšãæãåºããŠãã ããã å®å šããã¯ã¢ãããäœæããã«ã¯ãã¡ã¢ãªããã®ããŒã¿ãå¿ èŠã§ã (ã¡ã ããŒãã«) ãã£ã¹ã¯ã«ç§»å (SSTããŒãã«ïŒã ãã®æç¹ã§ãCassandra ããŒãã¯æ¥ç¶ã®åãå ¥ããåæ¢ããã¯ã©ã¹ã¿ãŒããå®å šã«ã·ã£ããããŠã³ãããŸãã
ãã®åŸãããã¯ã¢ããã¯åé€ãããŸã (ã¹ãããã·ã§ãã) ã¹ããŒã ãä¿åãããŸã (ããŒã¹ããŒã¹ïŒã ãããŠãããã¯ã¢ããã ãã§ã¯äœãåŸãããªãããšãããããŸãããCassandra ããŒããæ åœããŠããããŒã¿èå¥åãä¿åããå¿ èŠããããŸãããããã¯ç¹å¥ãªããŒã¯ã³ã§ãã
Cassandra ããŒããæ
åœããããŒã¿ãç¹å®ããããã®ããŒã¯ã³ã®é
åž
Kubernetes 㧠Google ãã Cassandra ããã¯ã¢ãããååŸããããã®ãµã³ãã« ã¹ã¯ãªããã¯ã次ã®å Žæã«ãããŸãã
set -eu
if [[ -z "$1" ]]; then
info "Please provide a keyspace"
exit 1
fi
KEYSPACE="$1"
result=$(nodetool snapshot "${KEYSPACE}")
if [[ $? -ne 0 ]]; then
echo "Error while making snapshot"
exit 1
fi
timestamp=$(echo "$result" | awk '/Snapshot directory: / { print $3 }')
mkdir -p /tmp/backup
for path in $(find "/var/lib/cassandra/data/${KEYSPACE}" -name $timestamp); do
table=$(echo "${path}" | awk -F "[/-]" '{print $7}')
mkdir /tmp/backup/$table
mv $path /tmp/backup/$table
done
tar -zcf /tmp/backup.tar.gz -C /tmp/backup .
nodetool clearsnapshot "${KEYSPACE}"
XNUMX ã€ã® Cassandra ããŒãããããã¯ã¢ãããååŸãã bash ã¹ã¯ãªããã®äŸ
Kubernetes ã® Cassandra åãã®ããã«äœ¿ãããœãªã¥ãŒã·ã§ã³
çŸåšãKubernetes ã« Cassandra ããããã€ããããã«äœã䜿çšãããŠããŸãã?ãŸããæå®ãããèŠä»¶ã«æãé©ããŠããã®ã¯ã©ãã§ãã?
1. StatefulSet ãŸã㯠Helm ãã£ãŒãã«åºã¥ããœãªã¥ãŒã·ã§ã³
åºæ¬ç㪠StatefulSet é¢æ°ã䜿çšã㊠Cassandra ã¯ã©ã¹ã¿ãŒãå®è¡ããããšã¯ãè¯ãéžæè¢ã§ãã Helm ãã£ãŒããš Go ãã³ãã¬ãŒãã䜿çšãããšãCassandra ããããã€ããããã®æè»ãªã€ã³ã¿ãŒãã§ã€ã¹ããŠãŒã¶ãŒã«æäŸã§ããŸãã
éåžžãããã¯æ£åžžã«åäœããŸã...ããŒãé害ãªã©ã®äºæãã¬äºæ ãçºçãããŸã§ã¯ã æšæºã® Kubernetes ããŒã«ã§ã¯ãäžèšã®ãã¹ãŠã®æ©èœãèæ ®ããããšã¯ã§ããŸããã ããã«ããã®ã¢ãããŒãã¯ãããŒãã®äº€æãããã¯ã¢ããããªã«ããªãç£èŠãªã©ãããè€éãªçšéã«æ¡åŒµã§ããç¯å²ãéåžžã«éãããŠããŸãã
代衚è ïŒ
ã©ã¡ãã®ãã£ãŒããåæ§ã«åªããŠããŸãããäžèšã®åé¡ãçºçããå¯èœæ§ããããŸãã
2. Kubernetes Operator ãããŒã¹ãšãããœãªã¥ãŒã·ã§ã³
ãã®ãããªãªãã·ã§ã³ã¯ãã¯ã©ã¹ã¿ãŒã管çããããã®ååãªæ©äŒãæäŸãããããããèå³æ·±ããã®ã«ãªããŸãã Cassandra ãªãã¬ãŒã¿ãŒãèšèšããå Žåãä»ã®ããŒã¿ããŒã¹ãšåæ§ã«ããµã€ãã«ãŒ <-> ã³ã³ãããŒã©ãŒ <-> CRD ã®ãããªãã¿ãŒã³ãé©ããŠããŸãã
é©åã«èšèšããã Cassandra ãªãã¬ãŒã¿ãŒã®ããŒã管çã¹ããŒã
æ¢åã®æŒç®åãèŠãŠã¿ãŸãããã
1. Cassandra - instaclustr ã®ãªãã¬ãŒã¿ãŒ
-
GitHubã® - æºåç¶æ³: ã¢ã«ãã¡
- ã©ã€ã»ã³ã¹: Apache 2.0
- å®è£ èšèª: Java
ããã¯ç¢ºãã«ããããŒãžã Cassandra ãããã€ã¡ã³ããæäŸããäŒç€Ÿã«ãããéåžžã«ææã§ç©æ¥µçã«éçºäžã®ãããžã§ã¯ãã§ãã äžã§èª¬æããããã«ãHTTP çµç±ã§ã³ãã³ããåãå ¥ãããµã€ãã«ãŒ ã³ã³ãããŒã䜿çšããŸãã Java ã§æžãããŠãããããclient-go ã©ã€ãã©ãªã®ããé«åºŠãªæ©èœãæ¬ ããŠããå ŽåããããŸãã ãŸãããªãã¬ãŒã¿ãŒã¯ XNUMX ã€ã®ããŒã¿ã»ã³ã¿ãŒã«å¯ŸããŠç°ãªãã©ãã¯ããµããŒãããŠããŸããã
ãã ãããªãã¬ãŒã¿ãŒã«ã¯ãç£èŠã®ãµããŒããCRD ã䜿çšããé«åºŠãªã¯ã©ã¹ã¿ãŒç®¡çãããã«ã¯ããã¯ã¢ããäœæã®ããã®ææžåãªã©ã®å©ç¹ããããŸãã
2. Jetstack ã®ããã²ãŒã¿ãŒ
-
GitHubã® - æºåç¶æ³: ã¢ã«ãã¡
- ã©ã€ã»ã³ã¹: Apache 2.0
- å®è£ èšèª: Golang
DB-as-a-Service ãå°å ¥ããããã«èšèšãããã¹ããŒãã¡ã³ãã çŸåšãElasticsearch ãš Cassandra ã® XNUMX ã€ã®ããŒã¿ããŒã¹ããµããŒãããŠããŸãã ããã«ã¯ãRBAC ãä»ããããŒã¿ããŒã¹ ã¢ã¯ã»ã¹å¶åŸ¡ãªã©ã®èå³æ·±ããœãªã¥ãŒã·ã§ã³ããããŸã (ãã®ããã«ãç¬èªã®å¥åã® navigator-apiserver ããããŸã)ã èå³æ·±ããããžã§ã¯ãã§ããã詳ããèŠãŠã¿ã䟡å€ã¯ãããŸãããæåŸã®ã³ãããã XNUMX 幎ååã«è¡ãããããããã®å¯èœæ§ã¯æããã«äœäžããŠããŸãã
3. Cassandra ãªãã¬ãŒã¿ãŒ (vgkowski è)
-
GitHubã® - æºåç¶æ³: ã¢ã«ãã¡
- ã©ã€ã»ã³ã¹: Apache 2.0
- å®è£ èšèª: Golang
ãªããžããªãžã®æåŸã®ã³ããã㯠1.9 幎以äžåã ã£ãããã圌ãã¯ããããçå£ã«ãèããŠããŸããã§ããã ãªãã¬ãŒã¿ãŒã®éçºã¯æŸæ£ãããŸããããµããŒããããŠãããšå ±åããã Kubernetes ã®ææ°ããŒãžã§ã³ã¯ XNUMX ã§ãã
4. Cassandra - Rook ã«ãããªãã¬ãŒã¿ãŒ
-
GitHubã® - æºåç¶æ³: ã¢ã«ãã¡
- ã©ã€ã»ã³ã¹: Apache 2.0
- å®è£ èšèª: Golang
éçºãæãããã«é²ãã§ããªããªãã¬ãŒã¿ãŒã ã¯ã©ã¹ã¿ãŒç®¡ççšã«ããèãããã CRD æ§é ããããClusterIP ã«ãããµãŒãã¹ (åããããã¯ã) ã䜿çšããŠããŒããèå¥ããåé¡ã解決ããŸã...ããããä»ã¯ãããŸã§ã§ãã çŸåšã®ãšãããããã«äœ¿çšã§ããç£èŠãããã¯ã¢ããã¯ãããŸãã (ã¡ãªã¿ã«ãç§ãã¡ã¯ç£èŠãç®çãšããŠããŸã)
泚æ: ç§ãã¡ã¯ããããžã§ã¯ãã® 4 ã€ã§ãã®æŒç®åãè¥å¹²ã®å€æŽãå ããŠäœ¿çšããŸããã å šéçšæéïŒçŽXNUMXãæã®éçšïŒãéããŠããªãã¬ãŒã¿ã®äœæ¥ã«åé¡ã¯èŠãããŸããã§ããã
5. ãªã¬ã³ãžã®ãã£ã¹ã³ãã
-
GitHubã® - æºåç¶æ³: ã¢ã«ãã¡
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