Question 124548 in Memcached Question posted in
A decent usage manual can be found here.

Memcached – Couchbase with Azure Linux VM

I installed ubuntu server VM on Azure there I installed couchbase community edition on now i need to access the couchbase using dotnet SDK but code gives me bucket not found or unreachable error.
even i try configuring a public dns and gave it as ip during cluster creation but still its giving the same.
even i added public dns to the host file like below
127.0.0.1 public dns
The SDK log includes below 2 statements
Attempted bootstrapping on endpoint "name.eastus.cloudapp.azure.com" has failed. (e80489ed)
A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.

SDK Doctor Log:

09:51:20.331 INFO ▶ Parsing connection string `couchbases://hsotname.eastus.cloudapp.azure.com/travel-sample`
09:51:20.334 INFO ▶ Connection string was parsed as a potential DNS SRV record
09:51:31.316 INFO ▶ Connection string specifies to use secured connections
09:51:31.316 INFO ▶ Connection string identifies the following CCCP endpoints:
09:51:31.316 INFO ▶   1. hsotname.eastus.cloudapp.azure.com:11207
09:51:31.316 INFO ▶ Connection string identifies the following HTTP endpoints:
09:51:31.316 INFO ▶   1. hsotname.eastus.cloudapp.azure.com:18091
09:51:31.316 INFO ▶ Connection string specifies bucket `travel-sample`
09:51:31.316 WARN ▶ No certificate authority file specified (--tls-ca), skipping server certificate verification for this run.
09:51:42.453 WARN ▶ Your connection string specifies only a single host.  You should consider adding additional static nodes from your cluster to this list to improve your applications fault-tolerance
09:51:42.462 INFO ▶ Performing DNS lookup for host `hsotname.eastus.cloudapp.azure.com`
09:51:42.462 INFO ▶ Bootstrap host `hsotname.eastus.cloudapp.azure.com` refers to a server with the address `13.82.80.55`
09:51:42.462 INFO ▶ Attempting to connect to cluster via CCCP
09:51:42.463 INFO ▶ Attempting to fetch config via cccp from `hsotname.eastus.cloudapp.azure.com:11207`
09:51:44.474 ERRO ▶ Failed to fetch configuration via cccp from `hsotname.eastus.cloudapp.azure.com:11207` (error: dial tcp 13.82.80.55:11207: i/o timeout)
09:51:44.474 INFO ▶ Attempting to connect to cluster via HTTP (Terse)
09:51:44.474 INFO ▶ Attempting to fetch terse config via http from `hsotname.eastus.cloudapp.azure.com:18091`
09:51:46.480 ERRO ▶ Failed to fetch terse configuration via http from `hsotname.eastus.cloudapp.azure.com:18091` (error: Get "http://hsotname.eastus.cloudapp.azure.com:18091/pools/default/b/travel-sample": context deadline exceeded (Client.Timeout exceeded while awaiting headers))
09:51:46.480 INFO ▶ Attempting to connect to cluster via HTTP (Full)
09:51:46.480 INFO ▶ Failed to connect via HTTP (Full), as it is not yet supported by the doctor
09:51:46.481 INFO ▶ Selected the following network type:
09:51:46.481 ERRO ▶ All endpoints specified by your connection string were unreachable, further cluster diagnostics are not possible
09:51:46.481 INFO ▶ Diagnostics completed

Summary:
←[33m[WARN]←[0m No certificate authority file specified (--tls-ca), skipping server certificate verification for this run.
←[33m[WARN]←[0m Your connection string specifies only a single host.  You should consider adding additional static nodes from your cluster to this list to improve your applications fault-tolerance
←[31m[ERRO]←[0m Failed to fetch configuration via cccp from `hsotname.eastus.cloudapp.azure.com:11207` (error: dial tcp 13.82.80.55:11207: i/o timeout)
←[31m[ERRO]←[0m Failed to fetch terse configuration via http from `hsotname.eastus.cloudapp.azure.com:18091` (error: Get "http://hsotname.eastus.cloudapp.azure.com:18091/pools/default/b/travel-sample": context deadline exceeded (Client.Timeout exceeded while awaiting headers))
←[31m[ERRO]←[0m All endpoints specified by your connection string were unreachable, further cluster diagnostics are not possible

Found multiple issues, see listing above.

Both 18091 and 11207 port i added as inbound rule.
my ufw status is inactive
The above mentioned 2 ports are not listening

couchbaseadm@couchbasedbserver:~$ sudo lsof -i -P -n | grep LISTEN

systemd-r   926 systemd-resolve   13u  IPv4   18715      0t0  TCP 127.0.0.53:53 (LISTEN)
sshd       1103            root    3u  IPv4   21086      0t0  TCP *:22 (LISTEN)
sshd       1103            root    4u  IPv6   21088      0t0  TCP *:22 (LISTEN)
beam.smp   6323       couchbase   17u  IPv4 3937812      0t0  TCP 127.0.0.1:21200 (LISTEN)
epmd       6354       couchbase    3u  IPv4 3937267      0t0  TCP *:4369 (LISTEN)
epmd       6354       couchbase    4u  IPv6 3937268      0t0  TCP *:4369 (LISTEN)
beam.smp   6465       couchbase   34u  IPv4 3943391      0t0  TCP *:21100 (LISTEN)
beam.smp   6465       couchbase   48u  IPv4 3938657      0t0  TCP *:8091 (LISTEN)
beam.smp   6514       couchbase   17u  IPv4 3938608      0t0  TCP 127.0.0.1:21300 (LISTEN)
beam.smp   6514       couchbase   27u  IPv4 3938628      0t0  TCP *:8092 (LISTEN)
prometheu  6563       couchbase    9u  IPv4 3938650      0t0  TCP 127.0.0.1:9123 (LISTEN)
goxdcr     6583       couchbase   11u  IPv4 3938705      0t0  TCP 127.0.0.1:9998 (LISTEN)
memcached  6592       couchbase    5u  IPv4 3938689      0t0  TCP 127.0.0.1:11280 (LISTEN)
memcached  6592       couchbase   12u  IPv4 3937931      0t0  TCP *:11210 (LISTEN)
memcached  6592       couchbase   13u  IPv4 3937932      0t0  TCP *:11209 (LISTEN)
memcached  6592       couchbase   14u  IPv6 3937933      0t0  TCP *:11210 (LISTEN)
memcached  6592       couchbase   15u  IPv6 3937934      0t0  TCP *:11209 (LISTEN)
indexer    6741       couchbase   16u  IPv4 3944492      0t0  TCP *:9101 (LISTEN)
indexer    6741       couchbase   19u  IPv4 3944066      0t0  TCP *:9100 (LISTEN)
indexer    6741       couchbase   20u  IPv4 3944500      0t0  TCP *:9102 (LISTEN)
indexer    6741       couchbase   69u  IPv4 3946013      0t0  TCP *:9105 (LISTEN)
projector  6762       couchbase    9u  IPv4 3944075      0t0  TCP *:9999 (LISTEN)
cbq-engin  6782       couchbase    7u  IPv6 3944534      0t0  TCP *:8093 (LISTEN)
cbq-engin  6782       couchbase    8u  IPv4 3944535      0t0  TCP *:8093 (LISTEN)
cbft       6799       couchbase    8u  IPv4 3944112      0t0  TCP *:9130 (LISTEN)
cbft       6799       couchbase    9u  IPv4 3944149      0t0  TCP *:8094 (LISTEN)
sync_gate 11950    sync_gateway    8u  IPv4 4119414      0t0  TCP 127.0.0.1:4985 (LISTEN)
sync_gate 11950    sync_gateway    9u  IPv6 4119422      0t0  TCP *:4984 (LISTEN)

Here is the stacktrace:

StackTrace " at Couchbase.Core.ClusterContext.d__58.MoveNext()rn
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()rn
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)rn
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)rn
at System.Threading.Tasks.ValueTask1.get_Result()rn at System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable1.ConfiguredValueTaskAwaiter.GetResult()rn
at Couchbase.Cluster.<>c__DisplayClass30_0.<b__0>d.MoveNext()rn
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()rn
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)rn
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)rn
at System.Threading.Tasks.ValueTask1.get_Result()rn at System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable1.ConfiguredValueTaskAwaiter.GetResult()rn

Dotnet SDK Log

2022-02-09T17:28:46.3409884+05:30  [DBG] Waiting for 00:00:02.5000000 before polling. (c8639b24)
2022-02-09T17:28:48.8643285+05:30  [DBG] Done waiting, polling... (93018145)
2022-02-09T17:28:48.8649060+05:30  [DBG] Waiting for 00:00:02.5000000 before polling. (c8639b24)
2022-02-09T17:28:51.3664735+05:30  [DBG] Done waiting, polling... (93018145)
2022-02-09T17:28:51.3667541+05:30  [DBG] Waiting for 00:00:02.5000000 before polling. (c8639b24)
2022-02-09T17:28:53.8811651+05:30  [DBG] Done waiting, polling... (93018145)
2022-02-09T17:28:53.8814100+05:30  [DBG] Waiting for 00:00:02.5000000 before polling. (c8639b24)
2022-02-09T17:28:56.3823825+05:30  [DBG] Done waiting, polling... (93018145)
2022-02-09T17:28:56.3826183+05:30  [DBG] Waiting for 00:00:02.5000000 before polling. (c8639b24)
2022-02-09T17:28:58.8964320+05:30  [DBG] Done waiting, polling... (93018145)
2022-02-09T17:28:58.8967224+05:30  [DBG] Waiting for 00:00:02.5000000 before polling. (c8639b24)
2022-02-09T17:29:01.4007664+05:30  [DBG] Done waiting, polling... (93018145)
2022-02-09T17:29:01.4010274+05:30  [DBG] Waiting for 00:00:02.5000000 before polling. (c8639b24)
2022-02-09T17:29:01.7019750+05:30  [INF] Error trying to retrieve DNS SRV entries. (addddf06)
DnsClient.DnsResponseException: Query 12389 => _couchbases._tcp.hsotname.eastus.cloudapp.azure.com IN SRV on 192.168.8.1:53 timed out or is a transient error.
 ---> System.OperationCanceledException: The operation was canceled.
   at System.Threading.Tasks.TaskExtensions.WithCancellation[T](Task`1 task, CancellationToken cancellationToken, Action onCancel)
   at DnsClient.LookupClient.ResolveQueryAsync(IReadOnlyList`1 servers, DnsQuerySettings settings, DnsMessageHandler handler, DnsRequestMessage request, LookupClientAudit audit, CancellationToken cancellationToken)
   --- End of inner exception stack trace ---
   at DnsClient.LookupClient.ResolveQueryAsync(IReadOnlyList`1 servers, DnsQuerySettings settings, DnsMessageHandler handler, DnsRequestMessage request, LookupClientAudit audit, CancellationToken cancellationToken)
   at DnsClient.LookupClient.QueryInternalAsync(DnsQuestion question, DnsQuerySettings queryOptions, IReadOnlyCollection`1 servers, CancellationToken cancellationToken)
   at Couchbase.DnsClientDnsResolver.GetDnsSrvEntriesAsync(Uri bootstrapUri, CancellationToken cancellationToken)
   at Couchbase.Core.ClusterContext.BootstrapGlobalAsync()
2022-02-09T17:29:01.7034867+05:30  [DBG] Bootstrapping with node "hsotname.eastus.cloudapp.azure.com" (98ca0e33)
2022-02-09T17:29:03.9124149+05:30  [DBG] Done waiting, polling... (93018145)
2022-02-09T17:29:03.9127285+05:30  [DBG] Waiting for 00:00:02.5000000 before polling. (c8639b24)
2022-02-09T17:29:06.4201295+05:30  [DBG] Done waiting, polling... (93018145)
2022-02-09T17:29:06.4205385+05:30  [DBG] Waiting for 00:00:02.5000000 before polling. (c8639b24)
2022-02-09T17:29:08.9317820+05:30  [DBG] Done waiting, polling... (93018145)
2022-02-09T17:29:08.9320832+05:30  [DBG] Waiting for 00:00:02.5000000 before polling. (c8639b24)
2022-02-09T17:29:11.4459313+05:30  [DBG] Done waiting, polling... (93018145)
2022-02-09T17:29:11.4463142+05:30  [DBG] Waiting for 00:00:02.5000000 before polling. (c8639b24)
2022-02-09T17:29:12.1488979+05:30  [DBG] Attempted bootstrapping on endpoint "hsotname.eastus.cloudapp.azure.com" has failed. (e80489ed)
System.Net.Sockets.SocketException (10060): A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
   at Couchbase.Core.IO.Connections.ConnectionFactory.CreateAndConnectAsync(HostEndpointWithPort hostEndpoint, CancellationToken cancellationToken)
   at Couchbase.Core.IO.Connections.ConnectionPoolBase.CreateConnectionAsync(CancellationToken cancellationToken)
   at Couchbase.Core.IO.Connections.DataFlow.DataFlowConnectionPool.<>c__DisplayClass30_0.<<AddConnectionsAsync>g__StartConnection|0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Couchbase.Core.IO.Connections.DataFlow.DataFlowConnectionPool.AddConnectionsAsync(Int32 count, CancellationToken cancellationToken)
   at Couchbase.Core.IO.Connections.DataFlow.DataFlowConnectionPool.InitializeAsync(CancellationToken cancellationToken)
   at Couchbase.Core.ClusterNode.InitializeAsync()
   at Couchbase.Core.DI.ClusterNodeFactory.CreateAndConnectAsync(HostEndpointWithPort endPoint, BucketType bucketType, NodeAdapter nodeAdapter, CancellationToken cancellationToken)
   at Couchbase.Core.ClusterContext.BootstrapGlobalAsync()
2022-02-09T17:29:33.3259787+05:30  [DBG] Done waiting, polling... (93018145)
2022-02-09T17:29:33.3262710+05:30  [DBG] Waiting for 00:00:02.5000000 before polling. (c8639b24)
2022-02-09T17:29:35.8341848+05:30  [DBG] Done waiting, polling... (93018145)
2022-02-09T17:29:35.8343993+05:30  [DBG] Waiting for 00:00:02.5000000 before polling. (c8639b24)
2022-02-09T17:29:36.9552318+05:30  [DBG] Setting TCP Keep-Alives using SocketOptions - enable keep-alives True, time 00:01:00, interval 00:00:01. (d66a37aa)
2022-02-09T17:29:36.9596725+05:30  [DBG] Setting TCP Keep-Alives using SocketOptions - enable keep-alives True, time 00:01:00, interval 00:00:01. (d66a37aa)
2022-02-09T17:29:37.0170984+05:30  [INF] Cannot bootstrap bucket "travel-sample" as Couchbase. (1ecb21a9)
System.IO.IOException: The operation is not allowed on non-connected sockets.
   at System.Net.Sockets.NetworkStream..ctor(Socket socket, FileAccess access, Boolean ownsSocket)
   at Couchbase.Core.IO.Connections.ConnectionFactory.CreateAndConnectAsync(HostEndpointWithPort hostEndpoint, CancellationToken cancellationToken)
   at Couchbase.Core.IO.Connections.ConnectionPoolBase.CreateConnectionAsync(CancellationToken cancellationToken)
   at Couchbase.Core.IO.Connections.DataFlow.DataFlowConnectionPool.<>c__DisplayClass30_0.<<AddConnectionsAsync>g__StartConnection|0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Couchbase.Core.IO.Connections.DataFlow.DataFlowConnectionPool.AddConnectionsAsync(Int32 count, CancellationToken cancellationToken)
   at Couchbase.Core.IO.Connections.DataFlow.DataFlowConnectionPool.InitializeAsync(CancellationToken cancellationToken)
   at Couchbase.Core.ClusterNode.InitializeAsync()
   at Couchbase.Core.DI.ClusterNodeFactory.CreateAndConnectAsync(HostEndpointWithPort endPoint, BucketType bucketType, NodeAdapter nodeAdapter, CancellationToken cancellationToken)
   at Couchbase.Core.ClusterContext.CreateAndBootStrapBucketAsync(String name, HostEndpointWithPort endpoint, BucketType type)
   at Couchbase.Core.ClusterContext.GetOrCreateBucketAsync(String name)
2022-02-09T17:29:38.3360012+05:30  [DBG] Done waiting, polling... (93018145)
2022-02-09T17:29:38.3361875+05:30  [DBG] Waiting for 00:00:02.5000000 before polling. (c8639b24)
2022-02-09T17:29:40.3244490+05:30  [DBG] Setting TCP Keep-Alives using SocketOptions - enable keep-alives True, time 00:01:00, interval 00:00:01. (d66a37aa)
2022-02-09T17:29:40.3507801+05:30  [DBG] Setting TCP Keep-Alives using SocketOptions - enable keep-alives True, time 00:01:00, interval 00:00:01. (d66a37aa)
2022-02-09T17:29:40.3525230+05:30  [INF] Cannot bootstrap bucket "travel-sample" as Memcached. (1ecb21a9)
System.IO.IOException: The operation is not allowed on non-connected sockets.
   at System.Net.Sockets.NetworkStream..ctor(Socket socket, FileAccess access, Boolean ownsSocket)
   at Couchbase.Core.IO.Connections.ConnectionFactory.CreateAndConnectAsync(HostEndpointWithPort hostEndpoint, CancellationToken cancellationToken)
   at Couchbase.Core.IO.Connections.ConnectionPoolBase.CreateConnectionAsync(CancellationToken cancellationToken)
   at Couchbase.Core.IO.Connections.DataFlow.DataFlowConnectionPool.<>c__DisplayClass30_0.<<AddConnectionsAsync>g__StartConnection|0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Couchbase.Core.IO.Connections.DataFlow.DataFlowConnectionPool.AddConnectionsAsync(Int32 count, CancellationToken cancellationToken)
   at Couchbase.Core.IO.Connections.DataFlow.DataFlowConnectionPool.InitializeAsync(CancellationToken cancellationToken)
   at Couchbase.Core.ClusterNode.InitializeAsync()
   at Couchbase.Core.DI.ClusterNodeFactory.CreateAndConnectAsync(HostEndpointWithPort endPoint, BucketType bucketType, NodeAdapter nodeAdapter, CancellationToken cancellationToken)
   at Couchbase.Core.ClusterContext.CreateAndBootStrapBucketAsync(String name, HostEndpointWithPort endpoint, BucketType type)
   at Couchbase.Core.ClusterContext.GetOrCreateBucketAsync(String name)
2022-02-09T17:29:40.8385667+05:30  [DBG] Done waiting, polling... (93018145)
2022-02-09T17:29:40.8387609+05:30  [DBG] Waiting for 00:00:02.5000000 before polling. (c8639b24)
2022-02-09T17:29:43.3380840+05:30  [DBG] Done waiting, polling... (93018145)
2022-02-09T17:29:43.3382393+05:30  [DBG] Waiting for 00:00:02.5000000 before polling. (c8639b24)
2022-02-09T17:29:43.6633010+05:30  [DBG] Setting TCP Keep-Alives using SocketOptions - enable keep-alives True, time 00:01:00, interval 00:00:01. (d66a37aa)
2022-02-09T17:29:43.6842924+05:30  [DBG] Setting TCP Keep-Alives using SocketOptions - enable keep-alives True, time 00:01:00, interval 00:00:01. (d66a37aa)
2022-02-09T17:29:43.6862758+05:30  [INF] Cannot bootstrap bucket "travel-sample" as Ephemeral. (1ecb21a9)
System.IO.IOException: The operation is not allowed on non-connected sockets.
   at System.Net.Sockets.NetworkStream..ctor(Socket socket, FileAccess access, Boolean ownsSocket)
   at Couchbase.Core.IO.Connections.ConnectionFactory.CreateAndConnectAsync(HostEndpointWithPort hostEndpoint, CancellationToken cancellationToken)
   at Couchbase.Core.IO.Connections.ConnectionPoolBase.CreateConnectionAsync(CancellationToken cancellationToken)
   at Couchbase.Core.IO.Connections.DataFlow.DataFlowConnectionPool.<>c__DisplayClass30_0.<<AddConnectionsAsync>g__StartConnection|0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Couchbase.Core.IO.Connections.DataFlow.DataFlowConnectionPool.AddConnectionsAsync(Int32 count, CancellationToken cancellationToken)
   at Couchbase.Core.IO.Connections.DataFlow.DataFlowConnectionPool.InitializeAsync(CancellationToken cancellationToken)
   at Couchbase.Core.ClusterNode.InitializeAsync()
   at Couchbase.Core.DI.ClusterNodeFactory.CreateAndConnectAsync(HostEndpointWithPort endPoint, BucketType bucketType, NodeAdapter nodeAdapter, CancellationToken cancellationToken)
   at Couchbase.Core.ClusterContext.CreateAndBootStrapBucketAsync(String name, HostEndpointWithPort endpoint, BucketType type)
   at Couchbase.Core.ClusterContext.GetOrCreateBucketAsync(String name)

Thanks!!

Tags:

2

Answers


  1. Chosen as BEST ANSWER
    0

    I resolve the issue by changing the connection string for couchbase

    from

    couchbase://

    to

    http://

  2. 0

    Thank you for providing so much detailed information! I suspect the immediate issue is that you are trying to connect using TLS, which is not supported by Couchbase Community Edition (at least not as of February 2022). Ports 11207 and 18091 are for TLS connections; as you observed in the lsof output, the server is not listening on those ports.

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