Scaling a Multi-Tenant k8s Cluster in a Telco Pablo Moncada October 28, 2020 About MasMovil group ● 4th telecom company in Spain ● Provides voice and broadband services to +12M customers ● Several complexity Scalability Availability Observability Security Reliability Messaging Analytics Multi-tenancy caveats ● Single underlying infrastructure ● Reduce operational complexity ○ Infrastructure Services +3k CPU +2k Mem +5TB Nodes +300 kube-proxy replacement NetworkPolicy logging Multi-cluster DNS Aware NetworkPolicy Increased Istio security External Services TLS visibility Performance

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 2.14 Multi-Processing Modules (MPMs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 modules which you can choose to compile, Apache 2.0 has moved the main part of request processing into Multi-Processing Modules (p. 59) (MPMs). Run-Time Configuration Changes • Many directives that were in directive was put together with the HEADER directive, since it was a misnomer. Use Header always set foo bar instead to get the desired behaviour. Misc Changes • The module MOD AUTH DIGEST, which was

that it has been greatly simplified by removing all but the most essential configuration settings. A set of example configuration settings for more advanced features is present in the conf/extra/ directory httxt2dbm A new program used to generate dbm files from text input, for use in RewriteMap with the dbm map type. Module Developer Changes APR 1.0 API Apache 2.2 uses the APR 1.0 API. All deprecated functions execute special code only when the user passes -t to httpd. Set Threaded MPM's Stacksize A new directive, ThreadStackSize has been added to set the stack size on all threaded MPMs. This is required for

that it has been greatly simplified by removing all but the most essential configuration settings. A set of example configuration settings for more advanced features is present in the conf/extra/ directory httxt2dbm A new program used to generate dbm files from text input, for use in RewriteMap with the dbm map type. Module Developer Changes APR 1.0 API Apache 2.2 uses the APR 1.0 API. All deprecated functions execute special code only when the user passes -t to httpd. Set Threaded MPM's Stacksize A new directive, ThreadStackSize has been added to set the stack size on all threaded MPMs. This is required for

that it has been greatly simplified by removing all but the most essential configuration settings. A set of example configuration settings for more advanced features is present in the conf/extra/ directory httxt2dbm A new program used to generate dbm files from text input, for use in RewriteMap with the dbm map type. Module Developer Changes APR 1.0 API Apache 2.2 uses the APR 1.0 API. All deprecated functions execute special code only when the user passes -t to httpd. Set Threaded MPM's Stacksize A new directive, ThreadStackSize has been added to set the stack size on all threaded MPMs. This is required for

that it has been greatly simplified by removing all but the most essential configuration settings. A set of example configuration settings for more advanced features is present in the conf/extra/ directory httxt2dbm A new program used to generate dbm files from text input, for use in RewriteMap with the dbm map type. Module Developer Changes APR 1.0 API Apache 2.2 uses the APR 1.0 API. All deprecated functions execute special code only when the user passes -t to httpd. Set Threaded MPM's Stacksize A new directive, ThreadStackSize has been added to set the stack size on all threaded MPMs. This is required for

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 2.14 Multi-Processing Modules (MPMs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 that it has been greatly simplified by removing all but the most essential configuration settings. A set of example configuration settings for more advanced features is present in the conf/extra/ directory httxt2dbm A new program used to generate dbm files from text input, for use in REWRITEMAP with the dbm map type. Module Developer Changes APR 1.0 API Apache 2.2 uses the APR 1.0 API. All deprecated functions

that it has been greatly simplified by removing all but the most essential configuration settings. A set of example configuration settings for more advanced features is present in the conf/extra/ directory httxt2dbm A new program used to generate dbm files from text input, for use in RewriteMap with the dbm map type. Module Developer Changes APR 1.0 API Apache 2.2 uses the APR 1.0 API. All deprecated functions execute special code only when the user passes -t to httpd. Set Threaded MPM's Stacksize A new directive, ThreadStackSize has been added to set the stack size on all threaded MPMs. This is required for

Addresses and Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 2.14 Multi-Processing Modules (MPMs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 rotate Apache logs . . . . . . . . . . . . . . . . . . . . . . 313 8.17 split-logfile - Split up multi-vhost logfiles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 316 8.18 suexec - Switch only a basic set of modules is loaded. The other LOADMODULE directives are commented out. • configure: the "most" module set gets built by default • configure: the "reallyall" module set adds developer

Addresses and Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 2.14 Multi-Processing Modules (MPMs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 rotate Apache logs . . . . . . . . . . . . . . . . . . . . . . 313 8.17 split-logfile - Split up multi-vhost logfiles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 316 8.18 suexec - Switch only a basic set of modules is loaded. The other LOADMODULE directives are commented out. • configure: the "most" module set gets built by default • configure: the "reallyall" module set adds developer