diff --git a/charts/sourcegraph/README.md b/charts/sourcegraph/README.md
index 5810d11e..c5a643c4 100644
--- a/charts/sourcegraph/README.md
+++ b/charts/sourcegraph/README.md
@@ -162,7 +162,8 @@ In addition to the documented values, all services also support the following va
 | jaeger.collector.serviceAnnotations | object | `{}` | Add extra annotations to jaeger `collector` service |
 | jaeger.collector.serviceLabels | object | `{}` | Add extra labels to jaeger `collector` service |
 | jaeger.collector.serviceType | string | "ClusterIP" | Kubernetes service type of jaeger `collector` service, learn more from the [Kubernetes documentation](https://kubernetes.io/docs/concepts/services-networking/service/#publishing-services-service-types) |
-| jaeger.config | object | `{"logLevel":"info","maxTraces":20000,"samplingDefaultProbability":1}` | Jaeger v2 configuration overrides. These values are templated into a ConfigMap mounted at `/etc/jaeger/jaeger-config.yaml`. See https://www.jaegertracing.io/docs/2.16/configuration/ |
+| jaeger.config | object | `{"existingConfigMap":"","logLevel":"info","maxTraces":20000,"samplingDefaultProbability":1}` | Jaeger v2 configuration overrides. We only provide a limited number of options, use `existingConfigMap` to provide a full config if you need more control. |
+| jaeger.config.existingConfigMap | string | `""` | Name of an preexisting ConfigMap containing Jaeger configuration. They must contain a `jaeger-config.yaml` key. If set, this will be used instead of the `config` values below. See https://www.jaegertracing.io/docs/2.16/configuration/ |
 | jaeger.config.logLevel | string | `"info"` | Log level for the Jaeger instance (debug, info, warn, error) |
 | jaeger.config.maxTraces | int | `20000` | Maximum number of traces stored in memory |
 | jaeger.config.samplingDefaultProbability | float | `1` | Default sampling probability (0.0 to 1.0) returned to services that query Jaeger for sampling config |
diff --git a/charts/sourcegraph/templates/jaeger/jaeger.ConfigMap.yaml b/charts/sourcegraph/templates/jaeger/jaeger.ConfigMap.yaml
index c5d553f9..7e2a388c 100644
--- a/charts/sourcegraph/templates/jaeger/jaeger.ConfigMap.yaml
+++ b/charts/sourcegraph/templates/jaeger/jaeger.ConfigMap.yaml
@@ -1,4 +1,4 @@
-{{- if .Values.jaeger.enabled -}}
+{{- if and .Values.jaeger.enabled (not .Values.jaeger.config.existingConfigMap) -}}
 apiVersion: v1
 kind: ConfigMap
 metadata:
diff --git a/charts/sourcegraph/templates/jaeger/jaeger.Deployment.yaml b/charts/sourcegraph/templates/jaeger/jaeger.Deployment.yaml
index 409e462c..75c8961e 100644
--- a/charts/sourcegraph/templates/jaeger/jaeger.Deployment.yaml
+++ b/charts/sourcegraph/templates/jaeger/jaeger.Deployment.yaml
@@ -30,7 +30,9 @@ spec:
         kubectl.kubernetes.io/default-container: jaeger
         prometheus.io/port: "16686"
         sourcegraph.prometheus/scrape: "true"
+        {{- if not .Values.jaeger.config.existingConfigMap }}
         checksum/jaeger-config: {{ include (print $.Template.BasePath "/jaeger/jaeger.ConfigMap.yaml") . | sha256sum }}
+        {{- end }}
       {{- if .Values.sourcegraph.podAnnotations }}
       {{- toYaml .Values.sourcegraph.podAnnotations | nindent 8 }}
       {{- end }}
@@ -111,7 +113,7 @@ spec:
       volumes:
       - name: jaeger-config
         configMap:
-          name: {{ .Values.jaeger.name }}
+          name: {{ default .Values.jaeger.name .Values.jaeger.config.existingConfigMap }}
           items:
           - key: jaeger-config.yaml
             path: jaeger-config.yaml
diff --git a/charts/sourcegraph/values.yaml b/charts/sourcegraph/values.yaml
index 3a79dc62..cdb59b5f 100644
--- a/charts/sourcegraph/values.yaml
+++ b/charts/sourcegraph/values.yaml
@@ -1183,10 +1183,11 @@ jaeger:
     [
       "--config=/etc/jaeger/jaeger-config.yaml",
     ]
-  # -- Jaeger v2 configuration overrides. These values are templated into
-  # a ConfigMap mounted at `/etc/jaeger/jaeger-config.yaml`.
-  # See https://www.jaegertracing.io/docs/2.16/configuration/
+  # -- Jaeger v2 configuration overrides. We only provide a limited number of options, use `existingConfigMap` to provide a full config if you need more control.
   config:
+    # -- Name of an preexisting ConfigMap containing Jaeger configuration. They must contain a `jaeger-config.yaml` key. If set, this will be used instead of the `config` values below.
+    # See https://www.jaegertracing.io/docs/2.16/configuration/
+    existingConfigMap: ""
     # -- Maximum number of traces stored in memory
     maxTraces: 20000
     # -- Log level for the Jaeger instance (debug, info, warn, error)