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GitHub - Netflix/Hystrix: Hystrix is a latency and fault tolerance library designed to ... - 0 views

github.com/Hystrix netflix network java
shared by crazylion lee on 19 Apr 18 - No Cached
  • crazylion lee on 19 Apr 18
     
    "Hystrix is a latency and fault tolerance library designed to isolate points of access to remote systems, services and 3rd party libraries, stop cascading failure and enable resilience in complex distributed systems where failure is inevitable."
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GitHub - google/cloudprober: An active monitoring software to detect failures before yo... - 1 views

github.com/cloudprober google probe monitor ping
shared by crazylion lee on 16 Apr 18 - No Cached
  • crazylion lee on 16 Apr 18
     
    "An active monitoring software to detect failures before your customers do. https://cloudprober.org"
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GitHub - airbnb/paris: Define and apply styles to Android views programmatically - 0 views

github.com/paris android style airbnb
shared by crazylion lee on 16 Apr 18 - No Cached
  • crazylion lee on 16 Apr 18
     
    "Define and apply styles to Android views programmatically"
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GitHub - GoogleCloudPlatform/skaffold: Easy and Repeatable Kubernetes Development - 0 views

github.com/...skaffold k8s kubernetes deploy
shared by crazylion lee on 16 Apr 18 - No Cached
  • crazylion lee on 16 Apr 18
     
    "Easy and Repeatable Kubernetes Development"
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Getting Started with MariaDB Galera Cluster - MariaDB Knowledge Base - 0 views

mariadb.com/...ed-with-mariadb-galera-cluster mysql database cluster mariadb
shared by 張 旭 on 16 Apr 18 - No Cached
  • most users are not going to bootstrap a server by executing "mysqld --wsrep-new-cluster" manually.
  • galera_new_cluster
  • Prerequisites
  • ...7 more annotations...
  • Once you have a cluster running and you want to add/reconnect another node to it, you must supply an address of one of the cluster members in the cluster address URL
  • The new node only needs to connect to one of the existing members
  • It will automatically retrieve the cluster map and reconnect to the rest of the nodes
  • it's better to list all nodes of the cluster so that any node can join a cluster connecting to any other node, even if one or more are down
  • The wsrep_cluster_address parameter should be added in my.cnf of each node, listing all the nodes of the cluster,
  • the minimum recommended number of nodes in a cluster is 3
  • While two of the members will be engaged in state transfer, the remaining member(s) will be able to keep on serving client requests.
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使用 strace 了解程式讀取資料的來源 - fcamel - Medium - 0 views

medium.com/...E4%BE%86%E6%BA%90-aaa17ee2df2b strace debug
shared by crazylion lee on 15 Apr 18 - No Cached
  • crazylion lee on 15 Apr 18
     
    "strace 會列出程式執行的 system call，效率很好且不需要 debug symbol。我比較常用它找出影響程式行為設定檔的位置。 基本概念是開檔、讀取、寫入最後都會用到 system call，system call 數量不多，知道要用什麼 system call 作什麼事，就可以用 strace 觀察特定的 system call 得知很多資訊。比方說開檔一定要用 open，所以觀察 open 就能知道程式讀了那些檔案。 "
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GitHub - GoogleChrome/lighthouse: Auditing, performance metrics, and best practices for... - 0 views

github.com/...lighthouse pwa
shared by crazylion lee on 15 Apr 18 - No Cached
  • crazylion lee on 15 Apr 18
     
    "Auditing, performance metrics, and best practices for Progressive Web Apps"
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DNS Records: an Introduction - 0 views

linode.com/...dns-records-an-introduction dns server networking
shared by 張 旭 on 26 Mar 18 - No Cached
  • reading from right to left
  • top-level domain, or TLD
  • first-level subdomains plus their TLDs (example.com) are referred to as “domains.”
  • ...37 more annotations...
  • Name servers host a domain’s DNS information in a text file called the zone file
  • Start of Authority (SOA) records
  • You’ll want to specify at least two name servers. That way, if one of them is down, the next one can continue to serve your DNS information.
  • Every domain’s zone file contains the admin’s email address, the name servers, and the DNS records.
  • a zone file, which lists domains and their corresponding IP addresses (and a few other things)
  • TLD nameserver
  • ISPs cache a lot of DNS information after they’ve looked it up the first time
  • Usually caching is a good thing, but it can be a problem if you’ve recently made a change to your DNS information
  • An A record matches up a domain (or subdomain) to an IP address
  • point different subdomains to different IP addresses
  • An AAAA record is just like an A record, but for IPv6 IP addresses.
  • An AXFR record is a type of DNS record used for DNS replication
  • used on a slave DNS server to replicate the zone file from a master DNS server
  • DNS Certification Authority Authorization uses DNS to allow the holder of a domain to specify which certificate authorities are allowed to issue certificates for that domain.
  • A CNAME record or Canonical Name record matches up a domain (or subdomain) to a different domain.
  • You should not use a CNAME record for a domain that gets email, because some mail servers handle mail oddly for domains with CNAME records
  • the target domain for a CNAME record should have a normal A-record resolution
  • a CNAME record does not function the same way as a URL redirect
  • A DKIM record or domain keys identified mail record displays the public key for authenticating messages that have been signed with the DKIM protocol
  • An MX record or mail exchange record sets the mail delivery destination for a domain (or subdomain).
  • Ideally, an MX record should point to a domain that is also the hostname for its server.
  • Your MX records don’t necessarily have to point to your Linode. If you’re using a third-party mail service, like Google Apps, you should use the MX records they provide.
  • Lower numbers have a higher priority
  • NS records or name server records set the nameservers for a domain (or subdomain).
  • You can also set up different nameservers for any of your subdomains.
  • The order of NS records does not matter; DNS requests are sent randomly to the different servers, and if one host fails to respond, another one will be queried.
  • A PTR record or pointer record matches up an IP address to a domain (or subdomain), allowing reverse DNS queries to function.
  • PTR records are usually set with your hosting provider. They are not part of your domain’s zone file.
  • An SOA record or Start of Authority record labels a zone file with the name of the host where it was originally created.
  • The administrative email address is written with a period (.) instead of an at symbol (<@>).
  • The single nameserver mentioned in the SOA record is considered the primary master for the purposes of Dynamic DNS and is the server where zone file changes get made before they are propagated to all other nameservers.
  • An SPF record or Sender Policy Framework record lists the designated mail servers for a domain (or subdomain).
  • An SPF record for your domain tells other receiving mail servers which outgoing server(s) are valid sources of email, so they can reject spoofed email from your domain that has originated from unauthorized servers.
  • Your SPF record will have a domain or subdomain, type (which is TXT, or SPF if your name server supports it), and text (which starts with “v=spf1” and contains the SPF record settings).
  • An SRV record or service record matches up a specific service that runs on your domain (or subdomain) to a target domain.
  • A TXT record or text record provides information about the domain in question to other resources on the Internet.
  • One common use of the TXT record is to create an SPF record on nameservers that don’t natively support SPF.
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