A mongos

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mongo package - go.mongodb.org/mongo-driver/mongo - Go

On this pageRouting And Results ProcessHow mongos Handles Query ModifiersRead Preference and ShardsConfirm Connection to mongos InstancesTargeted Operations vs. Broadcast OperationsSharded Cluster SecurityMetadata OperationsAdditional InformationMongoDB mongos instances route queries and write operationsto shards in a sharded cluster. mongos provides theonly interface to a sharded cluster from the perspective ofapplications. Applications never connect or communicate directly withthe shards.The mongos tracks what data is on which shard by cachingthe metadata from the config servers. The mongos uses themetadata to route operations from applications and clients to themongod instances. A mongos has no persistentstate and consumes minimal system resources.The most common practice is to run mongos instances on thesame systems as your application servers, but you can maintainmongos instances on the shards or on other dedicatedresources. See also Number of mongos and Distribution.A mongos instance routes a query to a cluster by:Determining the list of shards that must receive thequery.Establishing a cursor on all targeted shards.The mongos then merges the data from each of thetargeted shards and returns the result document. Certainquery modifiers, such as sorting,are performed on each shard before mongosretrieves the results.Aggregation operations running on multipleshards may route results back to the mongos to merge results if they don't need to run on the database's primary shard.There are two cases in which a pipeline is ineligible to run onmongos.The first case occurs when the merge part of the split pipelinecontains a stage which must run on a primary shard. For instance,if $lookup requires access to an unsharded collection in the samedatabase as the sharded collection on which the aggregation is running,the merge is obliged to run on the primary shard.The second case occurs when the merge part of the split pipelinecontains a stage which may write temporary data to disk, such as$group, and the client has specified allowDiskUse:true. In thiscase, assuming that there are no other stages in the merge pipelinewhich require the primary shard, the merge runs on arandomly-selected shard in the set of shards targeted by the aggregation.For more information on how the work of aggregation is split amongcomponents of a sharded cluster query, use explain:true as aparameter to the aggregate() call. Thereturn includes three json objects. mergeType shows where thestage of the merge happens ("primaryShard", "anyShard", or "mongos").splitPipeline shows which operations in your pipeline have run onindividual shards. shards shows the work each shard has done.In some cases, when the shard key or a prefix of the shard Its correspondingmongosh method db.serverStatus() returnhedgingMetrics.To detect if the MongoDB instance that your client is connectedto is mongos, use the hello command. When aclient connects to a mongos, hello returnsa document with a msg field that holds the stringisdbgrid. For example:{ "isWritablePrimary" : true, "msg" : "isdbgrid", "maxBsonObjectSize" : 16777216, "ok" : 1, ...}If the application is instead connected to a mongod, thereturned document does not include the isdbgrid string.Generally, the fastest queries in a sharded environment are those thatmongos route to a single shard, using the shard key and thecluster meta data from the config server.These targeted operations use theshard key value to locate the shard or subset of shards that satisfy thequery document.For queries that don't include the shard key, mongos must query allshards, wait for their responses and then return the result to theapplication. These "scatter/gather" queries can be long running operations.mongos instances broadcast queries to all shards for thecollection unless the mongos candetermine which shard or subset of shards stores this data.After the mongos receives responses from all shards, it mergesthe data and returns the result document. The performance of a broadcastoperation depends on the overall load of the cluster, as well as variableslike network latency, individual shard load, and number of documents returnedper shard. Whenever possible, favor operations that result in targetedoperation over those that result in a broadcastoperation.Multi-update operations are always broadcast operations.The updateMany() anddeleteMany() methods are broadcastoperations, unless the query document specifies the shard key in full.mongos can route queries that include the shard key or the prefixof a compound shard key a specific shard or set ofshards. mongos uses the shard key value to locate thechunk whose range includes the shard key value and directs thequery at the shard containing that chunk.For example, if the shard key is:The mongos program can route queries that include the fullshard key or either of the following shard key prefixes at aspecific shard or set of shards:All insertOne() operations target to one shard. Eachdocument in the insertMany() array targets to asingle shard, but there is no guarantee all documents in the array insert intoa single shard.All updateOne(),replaceOne() and deleteOne()operations must include the shard key or _id in the querydocument. MongoDB returns an error if these methods are used withoutthe shard key or _id.Depending on the distribution of data in the cluster and the selectivity ofthe query, mongos may still perform a broadcastoperation to fulfill these queries.When a

mcp-mongo/mongo-explorer.py at main volkfox/mcp-mongo

Shard receives a query, it uses the most efficient indexavailable to fulfill that query. The index used may be either theshard key index or another eligibleindex present on the shard.Use Self-Managed Internal/Membership Authentication to enforce intra-clustersecurity and prevent unauthorized cluster components from accessing thecluster. You must start each mongod or mongos in thecluster with the appropriate security settings in order to enforce internalauthentication.Starting in MongoDB 5.3, SCRAM-SHA-1cannot be used for intra-cluster authentication. OnlySCRAM-SHA-256 is supported.In previous MongoDB versions, SCRAM-SHA-1 and SCRAM-SHA-256 can both beused for intra-cluster authentication, even if SCRAM is not explicitlyenabled.See Deploy Self-Managed Sharded Cluster with Keyfile Authentication for atutorial on deploying a secured sharded cluster.Sharded clusters support Role-Based Access Control in Self-Managed Deployments (RBAC) for restrictingunauthorized access to cluster data and operations. You must start eachmongod in the cluster, including the config servers, with the --auth option in order to enforce RBAC.Alternatively, enforcing Self-Managed Internal/Membership Authentication forinter-cluster security also enables user access controls via RBAC.With RBAC enforced, clients must specify a --username,--password, and--authenticationDatabase whenconnecting to the mongos in order to access cluster resources.Each cluster has its own cluster users. These users cannot be usedto access individual shards.See Enable Access Control on Self-Managed Deployments for a tutorial on enablingadding users to an RBAC-enabled MongoDB deployment.mongos uses "majority" write concernfor the following operations that affect the sharded clustermetadata:The mongos binary cannot connect to mongodinstances whose feature compatibility version (FCV) is greaterthan that of the mongos. For example, you cannot connecta MongoDB 4.0 version mongos to a 4.2sharded cluster with FCV set to 4.2. Youcan, however, connect a MongoDB 4.0 versionmongos to a 4.2 sharded cluster with FCV set to 4.0.mongod includes a Full Time Diagnostic Data Capture mechanism to assist MongoDB engineers with troubleshootingdeployments. If this thread fails, it terminates the originating process.To avoid the most common failures, confirm that the user running theprocess has permissions to create the FTDC diagnostic.datadirectory. For mongod the directory is withinstorage.dbPath. For mongos it is parallel to systemLog.path.Starting in MongoDB 4.2, MongoDB adds the parameterShardingTaskExecutorPoolReplicaSetMatching. Thisparameter determines the minimum size of themongod / mongos instance'sconnection pool to each member of the sharded cluster. This valuecan vary during runtime.mongod and mongos maintain connectionpools to each replica set secondary for every replica set in thesharded cluster. By default, these pools have a number of connectionsthat is at least the number of connections to the primary.To modify, see ShardingTaskExecutorPoolReplicaSetMatching.For more information on how sharding works with. Mongo and Cutie Mongo and Cutie Mongo and Cutie Mongo and Cutie Mongo and Cutie Mongo and Cutie Mongo and Cutie. Realistic (fiction), 44 words, Level C (Grade K)

GitHub - mongo-express/mongo-express-docker: a dockerized mongo

Keyis a part of the query, the mongos performs atargeted operation, routing queries toa subset of shards in the cluster.mongos performs a broadcastoperation for queries that do not include theshard key, routing queries to all shards in the cluster. Somequeries that do include the shard key may still result in a broadcastoperation depending on the distribution of data in the cluster and theselectivity of the query.See Targeted Operations vs. Broadcast Operations for more on targeted andbroadcast operations.mongos can support hedged reads tominimize latencies. See hedged reads formore information.If the result of the query is not sorted, the mongosinstance opens a result cursor that "round robins" results from allcursors on the shards.If the query limits the size of the result set using thelimit() cursor method, the mongosinstance passes that limit to the shards and then re-applies the limitto the result before returning the result to the client.If the query specifies a number of records to skip using theskip() cursor method, the mongos cannotpass the skip to the shards, but rather retrieves unskipped resultsfrom the shards and skips the appropriate number of documents when assemblingthe complete result.When used in conjunction with a limit(), themongos passes the limit plus the value of theskip() to the shards to improve the efficiency of theseoperations.For sharded clusters, mongos applies the readpreference when reading from the shards. Themember selected is governed by both the read preference andreplication.localPingThresholdMs settings, and isre-evaluated for each operation.For details on read preference and sharded clusters, seeRead Preference and Shards.mongos instances can hedgereads that use non-primary read preferences. With hedged reads, the mongosinstances route read operations to two replica set members per eachqueried shard and return results from the first respondent per shard.The additional read sent to hedge the read operation uses themaxTimeMS value of maxTimeMSForHedgedReads.Hedged reads are supported for the following operations:collStatscountdataSizedbStatsdistinctfilemd5findlistCollectionslistIndexesplanCacheListFiltersHedged reads are specified per operation as part of the readpreference. Non-primary read preferences support hedged reads. See Hedged ReadPreference Option.To specify hedged read for a non-primary read preference,refer to the driver read preference APIdocumentation.Read preference nearest enables the hedged read optionby default.For details on read preference and sharded clusters as well as memberselection, see Read Preference and Shards.By default, mongos instances support using hedgedreads. To turn off a mongos instance's support forhedged reads, see the readHedgingMode parameter. If thehedged read support is off, mongos does not usehedged reads regardless of the hedge option specified for theread preference.The command serverStatus and And/or dormant operations forthe MongoDB deployment.$listLocalSessionsLists all active sessions recently in use on the currentlyconnected mongos or mongodinstance. These sessions may have not yet propagated to thesystem.sessions collection.Starting in MongoDB 4.2, you can use the aggregation pipeline forupdates in:For the updates, the pipeline can consist of the following stages:$addFields and its alias $set$project and its alias $unset$replaceRoot and its alias $replaceWith.See also: Expressions can include field paths,literals, system variables, expression objects, and expression operators. Expressions can be nested.Aggregation expressions use field path to access fields in theinput documents. To specify a field path, prefix the field name or thedotted field name (if the field is inthe embedded document) with a dollar sign $. For example,"$user" to specify the field path for the user field or"$user.name" to specify the field path to "user.name" field."$" is equivalent to "$$CURRENT." where theCURRENT is a system variable that defaults to the root ofthe current object, unless stated otherwise in specific stages.MongoDB provides various aggregation system variables for use in expressions. To access variables,prefix the variable name with $$. For example:VariableAccess via $$Brief DescriptionNOW$$NOWReturns the current datetime value, which is same across allmembers of the deployment and remains constant throughout theaggregation pipeline. (Available in 4.2+)CLUSTER_TIME$$CLUSTER_TIMEReturns the current timestamp value, which is same across allmembers of the deployment and remains constant throughout theaggregation pipeline. For replica sets and sharded clustersonly. (Available in 4.2+)ROOT$$ROOTReferences the root document, i.e. the top-level document.CURRENT$$CURRENTReferences the start of the field path, which by default isROOT but can be changed.REMOVE$$REMOVEAllows for the conditional exclusion of fields. (Available in 3.6+)DESCEND$$DESCENDOne of the allowed results of a $redact expression.PRUNE$$PRUNEOne of the allowed results of a $redact expression.KEEP$$KEEPOne of the allowed results of a $redact expression.For a more detailed description of these variables, see systemvariables.Literals can be of any type. However, MongoDB parses string literalsthat

GitHub - mongo-express/mongo-express:

Her şirketin veya kurumun VPN Server’a ihtiyacı oluyor. Bu ihtiyaç hem güvenlik önlemi hem de uzaktan çalışma modeli için vazgeçilmez bir durum. Birçok VPN Server var hem yazılımsal hem de donanımsal olarak. Yazılımsal olarak en bilindik ve en yaygın kullanılanı OpenVPN Access Server ‘dır. Fakat OpenVPN Access Server aynı anda (concurrent) 2 kullanıcıya kadar ücretsiz kullanılabiliyor. Bu yazıda built-in 2FA desteği olan, OpenVPN teknolojisini kullanan Pritunl VPN Server’ı kurup yapılandıracağız ve tamamen ücretsiz olarak kullanacağız. Ben Ubuntu 20.04 üzerinden kurulum yapacağım sizler diğer Linux dağıtımları içinde aynı mantıkla kurulum yapabilirsiniz.Pritunl vpn server kurulum1. mongodb repo ekle ve imzalasudo wget -qO - | sudo apt-key add -sudo echo "deb [ arch=amd64,arm64 ] focal/mongodb-org/4.4 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-4.4.list2. Pritunl repo ekle ve imzalasudo tee /etc/apt/sources.list.d/pritunl.list sudo tee /etc/apt/sources.list.d/pritunl.list 3. apt güncellesudo apt update4. Pritunl için wireguard eklentisi (Opsiyonel)Wireguard desteğini kurmanızı tavsiye ederim. Linux çekirdiğine yeni eklenen vpn iletim teknolojisi. Pritunl varsayılan olarak OpenVPN altyapısını kullanır eğer wireguard desteğini de kurarsanız hem OpenVPN hem de wireguard’ı kullanabilirsiniz.sudo apt -y install wireguard wireguard-tools5. Pritunl ve mongodb kurulumusudo apt -y install pritunl mongodb-org=4.4.11 mongodb-org-server=4.4.11 mongodb-org-shell=4.4.11 mongodb-org-mongos=4.4.11 mongodb-org-tools=4.4.116. Pritunl ve mongodb çalıştır ve başlangıçta çalışmasını sağlasudo systemctl enable mongod pritunlsudo systemctl start mongod pritunlKurulumu tamamladık. Şimdi konfigürasyonları tamamlayarak aktif hale getirebiliriz.Konfigürasyon için adresine girelim.Setup key’i elde etmek için komutu server’a girin ve çıkan key’i Setup Key bölümüne girin. Eğer mongodb’yi benim gibi aynı servera kurduysanız MongoDB URI bu şekilde kalmalı. sudo pritunl setup-key#Örnek çıktıcc8159d00b7b45eea655ed53fe2ba0ceBu adımdan sonra karşınıza login sayfası gelecek kullanıcı adı ve şifreyi elde etmek için komutu server’a girelim.sudo pritunl default-passwordÖrnek çıktıroot@pritunl:~# sudo pritunl default-password[undefined][2022-06-08 21:46:55,677][INFO] Getting default administrator passwordAdministrator default password: username: "pritunl" password: "sFBS1w9APytX"Sisteme giriş yaptıktan sonra port ve domain gibi önemli ayarların olduğu bölüm sizi karşılayacak. Eğer bir domain kullanmak isterseniz bu sayfada ayarlayabilirsiniz. Domaininiz doğru şekilde yapılandırıldıysa Pritunl’in direkt Lets

mongod, mongo, mongos, mongosh. mongod

Status of themongod process, located at:/var/log/mongodb/mongod.log by default. A runningmongod instance will indicate that it is ready forconnections with the following line:[initandlisten] waiting for connections on port 27017As needed, you can stop the mongod process by issuing thefollowing command:Issue the following command to restart mongod:sudo service mongod restartTo completely remove MongoDB from a system, you must remove the MongoDBapplications themselves, the configuration files, and any directories containingdata and logs. The following section guides you through the necessary steps.WarningThis process will completely remove MongoDB, its configuration, and alldatabases. This process is not reversible, so ensure that all of yourconfiguration and data is backed up before proceeding.Stop the mongod process by issuing the following command:Remove any MongoDB packages that you had previously installed.sudo apt-get purge "mongodb-org*"Remove MongoDB databases and log files.sudo rm -r /var/log/mongodbsudo rm -r /var/lib/mongodbBy default, MongoDB launches with bindIp set to127.0.0.1, which binds to the localhost network interface. Thismeans that the mongod can only accept connections fromclients that are running on the same machine. Remote clients will not beable to connect to the mongod, and the mongod willnot be able to initialize a replica set unless this value is setto a valid network interface which is accessible from the remote clients.This value can be configured either:in the MongoDB configuration file with bindIp, orvia the command-line argument --bind_ipWarningFor more information on configuring bindIp, seeIP Binding in Self-Managed Deployments.MongoDB Community Edition is available from its own dedicatedrepository, and contains the following officially-supported packages:Package NameDescriptionmongodb-orgA metapackage that automatically installs the componentpackages listed below.mongodb-org-databaseA metapackage that automatically installs the componentpackages listed below.Package NameDescriptionmongodb-org-serverContains the mongod daemon, associated initscript, and a configuration file (/etc/mongod.conf). Youcan use the initialization script to start mongodwith the configuration file. For details, see the "Run MongoDBCommunity Edition" section, above.mongodb-org-mongosContains the mongos daemon.mongodb-mongoshContains the MongoDB Shell (mongosh).mongodb-org-toolsA metapackage that automatically installs the componentpackages listed below:Package NameDescriptionmongodb-database-toolsContains the following MongoDB database tools:mongodumpmongorestorebsondumpmongoimportmongoexportmongostatmongotopmongofilesmongodb-org-database-tools-extraContains the install_compass script. Mongo and Cutie Mongo and Cutie Mongo and Cutie Mongo and Cutie Mongo and Cutie Mongo and Cutie Mongo and Cutie. Realistic (fiction), 44 words, Level C (Grade K) Order Now Free Trial. Home; Books Passages ; Mongo and Cutie ; Previous. Next. Mongo and Cutie Mongo and Cutie Mongo and Cutie Mongo and Cutie Mongo and Cutie Mongo and Cutie

GitHub - Zizaco/confide-mongo: Confide Mongo is a

Driver's behavior:MethodDescriptionaddConnectionPoolListener()Adds a listener for connection pool-related events.applyConnectionString()Uses the settings from a ConnectionString object.applySettings()Uses the connection pool settings specified in aConnectionPoolSettings object.maintenanceFrequency()Sets the frequency for running a maintenance job.maintenanceInitialDelay()Sets the time to wait before running the first maintenance job.maxConnectionIdleTime()Sets the maximum time a connection can be idle before it's closed.maxConnectionLifeTime()Sets the maximum time a pooled connection can be alive before it'sclosed.maxSize()Sets the maximum number of connections associated with a connectionpool.Default: 100maxWaitTime()Sets the maximum time to wait for an available connection.Default: 2 minutesminSize()Sets the minimum number of connections associated with a connectionpool.Default: 0NoteThis maxSize and minSize settings apply to each serverin the cluster you connect the driver to.For example, assume you connect the driver to a cluster with threemongos servers. This means that there can be at most maxSizeconnections and at least minSize connections to each mongos server.This example specifies the following driver behavior in a pool ofConnection types:The thread to wait at most 10 SECONDS for an available connectionTo have at most 200 connections associated with the poolMongoClient mongoClient = MongoClients.create( MongoClientSettings.builder().applyConnectionString(new ConnectionString("")) .applyToConnectionPoolSettings(builder -> builder.maxWaitTime(10, SECONDS) .maxSize(200) .build());Chain the applyToLoggerSettings()method to modify the logging behavior of the driver.The following table describes the methods you can chain to yoursettings to modify the logging behavior:MethodDescriptionmaxDocumentLength()Sets the maximum document length, in characters, of a single logmessage.Default: 1000This example specifies that the maximum number of characters for a single logmessage is set to 5000 characters.MongoClient mongoClient = MongoClients.create( MongoClientSettings.builder().applyConnectionString(new ConnectionString("")) .applyToLoggerSettings(builder -> builder.maxDocumentLength(5_000)) .build());Chain the applyToServerSettings()method to modify the driver's behavior when monitoring each MongoDBdeployment.The following table describes the methods you can chain to yoursettings to modify the driver's behavior:MethodDescriptionaddServerListener()Adds a listener for server-related events.addServerMonitorListener()Adds a listener for server monitor-related events.applyConnectionString()Uses the settings from a ConnectionString object.applySettings()Uses the server settings specified in a ServerSettings object.heartbeatFrequency()Sets the interval for a cluster monitor to attempt reaching a server.Default: 10 secondsminHeartbeatFrequency()Sets the minimum interval for server monitoring checks.Default: 500 millisecondsThis example specifies the following driver behavior in a MongoDB deployment:The minimum interval for server monitoring checks to be at least700 MILLISECONDSThe cluster monitor to attempt reaching a server every 15 SECONDSMongoClient mongoClient = MongoClients.create( MongoClientSettings.builder().applyConnectionString(new ConnectionString(""))