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Posted to commits@camel.apache.org by nf...@apache.org on 2023/06/26 18:09:14 UTC
[camel-k] 01/01: Ref #4513: Allow to remote debug the Operator
This is an automated email from the ASF dual-hosted git repository.
nfilotto pushed a commit to branch 4513/remote-debug-operator
in repository https://gitbox.apache.org/repos/asf/camel-k.git
commit a49eb87e37dd57dbf416288956356f0674987bfc
Author: Nicolas Filotto <nf...@talend.com>
AuthorDate: Mon Jun 26 20:08:49 2023 +0200
Ref #4513: Allow to remote debug the Operator
---
.gitignore | 4 +
build/Dockerfile | 10 ++-
.../ROOT/pages/contributing/remote-debugging.adoc | 90 ++++++++++++++++++++++
pkg/cmd/install.go | 13 ++++
pkg/install/operator.go | 23 ++++++
script/Makefile | 23 ++++--
6 files changed, 156 insertions(+), 7 deletions(-)
diff --git a/.gitignore b/.gitignore
index 42d3fa167..50fa869a1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -176,3 +176,7 @@ config/**/*.gen.json
# Fabric8 CRDs
java/target
pkg/resources/resources.go
+
+MAC OS files
+.DS_Store
+
diff --git a/build/Dockerfile b/build/Dockerfile
index 4694eb062..0b5c9b06f 100644
--- a/build/Dockerfile
+++ b/build/Dockerfile
@@ -13,7 +13,7 @@
# See the License for the specific language governing permissions and
# limitations under the License.
-FROM eclipse-temurin:17-jdk
+FROM eclipse-temurin:17-jdk as base
ARG MAVEN_DEFAULT_VERSION="3.8.6"
ARG MAVEN_HOME="/usr/share/maven"
@@ -56,3 +56,11 @@ RUN mkdir -p /etc/maven/m2 \
USER 1000
ADD build/_output/bin/kamel /usr/local/bin/kamel
+
+FROM golang:1.19 as go
+
+RUN go install github.com/go-delve/delve/cmd/dlv@latest
+
+FROM base as debug
+
+COPY --from=go /go/bin/dlv /usr/local/bin/dlv
diff --git a/docs/modules/ROOT/pages/contributing/remote-debugging.adoc b/docs/modules/ROOT/pages/contributing/remote-debugging.adoc
new file mode 100644
index 000000000..92b3a3858
--- /dev/null
+++ b/docs/modules/ROOT/pages/contributing/remote-debugging.adoc
@@ -0,0 +1,90 @@
+[[debugging]]
+= Debugging Camel-K
+
+In this article, we describe the steps needed to be able to remote debug the Camel-K operator directly from the K8s cluster.
+By doing so you are sure that the operator is executed in the same context as your target environment which is not the case
+if the operator is launched on the local machine.
+
+[[publish-image]]
+== Publish the image
+
+The first thing to do is to build a specific docker image of the Camel-K operator for the debug mode, indeed the `kamel` program
+will then be built without compiler optimizations, and inlining but also the docker image will launch the operator through
+https://github.com/go-delve/delve[`delve`] to be able to remote debug the operator.
+
+[source,shell]
+----
+DEBUG_MODE=true make images
+----
+
+Once done, a tag of type `docker.io/apache/camel-k:2.0.0-SNAPSHOT-debug` is pushed into your local docker image registry.
+
+In case you are using Minikube, before executing the previous command make sure to set up properly the environment
+variables of your terminal by executing the command `eval $(minikube -p minikube docker-env)`, in that case the image is
+directly pushed into the registry of Minikube.
+
+For other cluster like for example `kind` where the registry is accessible from the host `localhost:5001`, simply tag the
+image to match with the new host and port with the next command:
+
+[source,shell]
+----
+docker tag docker.io/apache/camel-k:2.0.0-SNAPSHOT-debug localhost:5001/apache/camel-k:2.0.0-SNAPSHOT-debug
+----
+
+Then push the image to the target registry with next command:
+[source,shell]
+----
+docker push localhost:5001/apache/camel-k:2.0.0-SNAPSHOT-debug
+----
+
+To ensure that the image has been pushed with success, launch the following command
+[source,shell]
+----
+curl http://localhost:5001/v2/_catalog
+{"repositories":["apache/camel-k"]}
+----
+
+[[install-operator]]
+== Install the operator
+
+Since the docker image is ready to be used, we can now install the operator with the debugging flags to make sure that
+the operator will be launched properly with the debug port open on the corresponding pod.
+
+First, let's create a namespace in which the operator will be installed, here the namespace is `test`.
+[source,shell]
+----
+kubectl create ns test
+namespace/test created
+----
+
+Then install the operator with the image that we built before
+[source,shell]
+----
+./kamel install --olm=false --operator-image apache/camel-k:2.0.0-SNAPSHOT-debug --debugging -n test
+----
+It will install the operator using `apache/camel-k:2.0.0-SNAPSHOT-debug` as docker image in debug mode.
+
+[[port-forward]]
+== Open the port on the pod
+
+The operator is now waiting for a remote connection, but to make it possible, we need to make the debugging port of the
+pod accessible from outside the cluster thanks to the following `port-forward` command:
+
+[source,shell]
+----
+kubectl port-forward -n test $(kubectl get po -l app=camel-k -oname -n test) 4040:4040
+Forwarding from 127.0.0.1:4040 -> 4040
+Forwarding from [::1]:4040 -> 4040
+----
+This command port forwards the port `4040` of the pod to the local port `4040` which makes it accessible from localhost.
+Where `4040` is the default port of delve set on the pod, but it can be changed when installing the operator with the flag
+`--debugging-port=4040`
+
+[[configure-ide]]
+== Configure your IDE
+
+At this stage, you simply need to configure your favorite IDE to remote debug the operator using `localhost` as host and
+`4040` as port:
+
+* https://www.jetbrains.com/help/go/attach-to-running-go-processes-with-debugger.html#step-3-create-the-remote-run-debug-configuration-on-the-client-computer[Configure IDEA]
+* https://go.googlesource.com/vscode-go/+/HEAD/docs/debugging.md#remote-debugging[Configure VSCode]
diff --git a/pkg/cmd/install.go b/pkg/cmd/install.go
index 738d9a092..7c95ba1c2 100644
--- a/pkg/cmd/install.go
+++ b/pkg/cmd/install.go
@@ -140,6 +140,11 @@ func newCmdInstall(rootCmdOptions *RootCmdOptions) (*cobra.Command, *installCmdO
cmd.Flags().Bool("monitoring", false, "To enable or disable the operator monitoring")
cmd.Flags().Int("monitoring-port", 8080, "The port of the metrics endpoint")
+ // debugging
+ cmd.Flags().Bool("debugging", false, "To enable or disable the operator debugging")
+ cmd.Flags().Int("debugging-port", 4040, "The port of the debugger")
+ cmd.Flags().String("debugging-path", "/usr/local/bin/kamel", "The path to the kamel executable file")
+
// Operator settings
cmd.Flags().StringArray("toleration", nil, "Add a Toleration to the operator Pod")
cmd.Flags().StringArray("node-selector", nil, "Add a NodeSelector to the operator Pod")
@@ -196,6 +201,9 @@ type installCmdOptions struct {
MaxRunningBuilds int32 `mapstructure:"max-running-pipelines"`
Monitoring bool `mapstructure:"monitoring"`
MonitoringPort int32 `mapstructure:"monitoring-port"`
+ Debugging bool `mapstructure:"debugging"`
+ DebuggingPort int32 `mapstructure:"debugging-port"`
+ DebuggingPath string `mapstructure:"debugging-path"`
TraitProfile string `mapstructure:"trait-profile"`
Tolerations []string `mapstructure:"tolerations"`
NodeSelectors []string `mapstructure:"node-selectors"`
@@ -427,6 +435,11 @@ func (o *installCmdOptions) setupOperator(
Enabled: o.Monitoring,
Port: o.MonitoringPort,
},
+ Debugging: install.OperatorDebuggingConfiguration{
+ Enabled: o.Debugging,
+ Port: o.DebuggingPort,
+ Path: o.DebuggingPath,
+ },
Tolerations: o.Tolerations,
NodeSelectors: o.NodeSelectors,
ResourcesRequirements: o.ResourcesRequirements,
diff --git a/pkg/install/operator.go b/pkg/install/operator.go
index c76666a33..89d09fb69 100644
--- a/pkg/install/operator.go
+++ b/pkg/install/operator.go
@@ -57,6 +57,7 @@ type OperatorConfiguration struct {
ClusterType string
Health OperatorHealthConfiguration
Monitoring OperatorMonitoringConfiguration
+ Debugging OperatorDebuggingConfiguration
Tolerations []string
NodeSelectors []string
ResourcesRequirements []string
@@ -68,6 +69,12 @@ type OperatorHealthConfiguration struct {
Port int32
}
+type OperatorDebuggingConfiguration struct {
+ Enabled bool
+ Port int32
+ Path string
+}
+
type OperatorMonitoringConfiguration struct {
Enabled bool
Port int32
@@ -210,6 +217,22 @@ func OperatorOrCollect(ctx context.Context, cmd *cobra.Command, c client.Client,
FSGroup: &ugfid,
}
}
+ if cfg.Debugging.Enabled {
+ if d, ok := o.(*appsv1.Deployment); ok {
+ if d.Labels["camel.apache.org/component"] == "operator" {
+ d.Spec.Template.Spec.Containers[0].Command = []string{"dlv",
+ fmt.Sprintf("--listen=:%d", cfg.Debugging.Port), "--headless=true", "--api-version=2",
+ "exec", cfg.Debugging.Path, "--", "operator", "--leader-election=false"}
+ d.Spec.Template.Spec.Containers[0].Ports = append(d.Spec.Template.Spec.Containers[0].Ports, corev1.ContainerPort{
+ Name: "delve",
+ ContainerPort: cfg.Debugging.Port,
+ })
+ // In debug mode, the Liveness probe must be removed otherwise K8s will consider the pod as dead
+ // while debugging
+ d.Spec.Template.Spec.Containers[0].LivenessProbe = nil
+ }
+ }
+ }
if cfg.Global {
if d, ok := o.(*appsv1.Deployment); ok {
diff --git a/script/Makefile b/script/Makefile
index 2f41df8dc..6b6c5841d 100644
--- a/script/Makefile
+++ b/script/Makefile
@@ -54,7 +54,7 @@ RELEASE_GIT_REMOTE := origin
GIT_COMMIT := $(shell if [ -d .git ]; then git rev-list -1 HEAD; else echo "$(CUSTOM_VERSION)"; fi)
LINT_GOGC := 10
LINT_DEADLINE := 10m
-
+DEBUG_MODE ?= false
# olm bundle vars
MANAGER := config/manager
@@ -121,6 +121,10 @@ endif
GOFLAGS = -ldflags "$(GOLDFLAGS)" -trimpath
+ifeq ($(DEBUG_MODE),true)
+GOFLAGS += -gcflags="all=-N -l"
+endif
+
define LICENSE_HEADER
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
@@ -432,6 +436,17 @@ else
endif
cp build/_output/bin/kamel-$(IMAGE_ARCH) build/_output/bin/kamel
+DOCKER_TAG := $(CUSTOM_IMAGE):$(CUSTOM_VERSION)
+ifneq ($(IMAGE_ARCH), amd64)
+ DOCKER_TAG := $(DOCKER_TAG)-$(IMAGE_ARCH)
+endif
+
+ifeq ($(DEBUG_MODE),true)
+ TARGET_STAGE := debug
+ DOCKER_TAG := $(DOCKER_TAG)-debug
+else
+ TARGET_STAGE := base
+endif
images: build kamel-overlay maven-overlay bundle-kamelets
ifneq (,$(findstring SNAPSHOT,$(RUNTIME_VERSION)))
@@ -439,11 +454,7 @@ ifneq (,$(findstring SNAPSHOT,$(RUNTIME_VERSION)))
endif
@echo "####### Building Camel K operator arch $(IMAGE_ARCH) container image..."
mkdir -p build/_maven_output
-ifeq ($(IMAGE_ARCH), amd64)
- docker build --platform=linux/$(IMAGE_ARCH) -t $(CUSTOM_IMAGE):$(CUSTOM_VERSION) -f build/Dockerfile .
-else
- docker build --platform=linux/$(IMAGE_ARCH) -t $(CUSTOM_IMAGE):$(CUSTOM_VERSION)-$(IMAGE_ARCH) -f build/Dockerfile .
-endif
+ docker build --target $(TARGET_STAGE) --platform=linux/$(IMAGE_ARCH) -t $(DOCKER_TAG) -f build/Dockerfile .
# Mainly used for internal CI purposes
image-push: