diff --git a/bin/tee-vault-unseal/src/main.rs b/bin/tee-vault-unseal/src/main.rs
index 2244c5a..4b62483 100644
--- a/bin/tee-vault-unseal/src/main.rs
+++ b/bin/tee-vault-unseal/src/main.rs
@@ -61,6 +61,8 @@ pub struct UnsealServerConfig {
     pub vault_auth_tee_sha: String,
     /// version string of the vault_auth_tee plugin
     pub vault_auth_tee_version: String,
+    /// the common cacert file for the vault cluster
+    pub ca_cert_file: PathBuf,
 }
 
 /// Server state
@@ -101,6 +103,9 @@ struct Args {
     vault_auth_tee_sha_file: Option<PathBuf>,
     #[arg(long, env = "VAULT_AUTH_TEE_VERSION")]
     vault_auth_tee_version: String,
+    /// ca cert file
+    #[arg(long, env = "CA_CERT_FILE", default_value = "/opt/vault/cacert.pem")]
+    ca_cert_file: PathBuf,
     #[clap(flatten)]
     pub attestation: VaultAttestationArgs,
 }
@@ -156,6 +161,7 @@ async fn main() -> Result<()> {
         allowed_tcb_levels: Some(args.allowed_tcb_levels),
         vault_auth_tee_sha: args.vault_auth_tee_sha,
         vault_auth_tee_version: args.vault_auth_tee_version,
+        ca_cert_file: args.ca_cert_file,
     });
 
     let server_state = Arc::new(RwLock::new(server_state));
diff --git a/bin/tee-vault-unseal/src/unseal.rs b/bin/tee-vault-unseal/src/unseal.rs
index 0dee3d0..7d2c011 100644
--- a/bin/tee-vault-unseal/src/unseal.rs
+++ b/bin/tee-vault-unseal/src/unseal.rs
@@ -130,7 +130,7 @@ pub async fn post_unseal(
                 info!("Vault is unsealed and hopefully configured!");
                 info!("Initiating raft join");
                 // load TLS cert chain
-                let mut cert_file = File::open("/opt/vault/tls/cacert.pem")
+                let mut cert_file = File::open(&app.ca_cert_file)
                     .context("Failed to open TLS cert chain")
                     .status(StatusCode::INTERNAL_SERVER_ERROR)?;
 
diff --git a/packages/container-vault-start-config/cacert.conf b/packages/container-vault-start-config/cacert.conf
new file mode 100644
index 0000000..90b802f
--- /dev/null
+++ b/packages/container-vault-start-config/cacert.conf
@@ -0,0 +1,14 @@
+[ req ]
+distinguished_name = req_distinguished_name
+x509_extensions = v3_ca
+prompt = no
+
+[ req_distinguished_name ]
+O = Test CA, Limited
+CN = Test CA
+
+[ v3_ca ]
+subjectKeyIdentifier = hash
+authorityKeyIdentifier = keyid:always,issuer
+basicConstraints = critical,CA:true
+keyUsage = critical, digitalSignature, cRLSign, keyCertSign
diff --git a/packages/container-vault-start-config/cacert.pem b/packages/container-vault-start-config/cacert.pem
index 405b43f..d4289dc 100644
--- a/packages/container-vault-start-config/cacert.pem
+++ b/packages/container-vault-start-config/cacert.pem
@@ -1,7 +1,7 @@
 -----BEGIN CERTIFICATE-----
-MIIFSDCCAzCgAwIBAgIUDjUfoOY4o+E38mka8ViQOPpHBhgwDQYJKoZIhvcNAQEL
+MIIFSzCCAzOgAwIBAgIUI3GSJC4gh0ywYnHvGadGnt6N/6EwDQYJKoZIhvcNAQEL
 BQAwLTEZMBcGA1UECgwQVGVzdCBDQSwgTGltaXRlZDEQMA4GA1UEAwwHVGVzdCBD
-QTAeFw0yMzA2MDYwNzU4MTNaFw0yNDA2MDUwNzU4MTNaMC0xGTAXBgNVBAoMEFRl
+QTAeFw0yNDA3MDMwOTExNDVaFw0zNDA3MDEwOTExNDVaMC0xGTAXBgNVBAoMEFRl
 c3QgQ0EsIExpbWl0ZWQxEDAOBgNVBAMMB1Rlc3QgQ0EwggIiMA0GCSqGSIb3DQEB
 AQUAA4ICDwAwggIKAoICAQD4hjplzpqaXoWL/8bex/zBStuYmBuOGvIELS5aiHfw
 XfGnOwIViIMf+ikuxASYj3AmEmPOCXXbUsARe/0cHn438rVbeFK6cJl/kXlwGMOy
@@ -14,18 +14,18 @@ dTfsMir/q50io/l3nbPlzA28GwlZ3owdi22/Tdc+yg7NxOHPpJ6ZULK6d9n1glV5
 PDkO9J8Ad1MZwkKKMh+tPdccNarUkdBj0K8tpZqBmjhMWQddwAd5MZGWS0VBKBZb
 b5Z9ivqZ70oQSx8HKE3EGWSfT6ZJVhQ4XDAdMpw+wQcZQ+6twIpAQU3k6imJ4yGz
 ZYIOF2izn8Z4vBE4I/vKrpFci3mBDIJl59x49uAi5KpTBeeY/lLMnFLRa5sDUtLn
-kwIDAQABo2AwXjAdBgNVHQ4EFgQU4ZHyVkjYaunC0Rk9PtDsk8nALhcwHwYDVR0j
-BBgwFoAU4ZHyVkjYaunC0Rk9PtDsk8nALhcwDwYDVR0TAQH/BAUwAwEB/zALBgNV
-HQ8EBAMCAQYwDQYJKoZIhvcNAQELBQADggIBAIGigs3CZO1DdnaxZwUghMm95NAX
-D7vKYFAmoNtbVBv1NAfpv23XOhAzccEFGg20XEa1t2z0Nfct9NDXxZ2VCgU+9vws
-d96EBkufgnKrc/hLxRnVsExQxy5FKYz/d5LePeYd1OFS0bw+DRpzEnFZm34vpToj
-mku845LtHbeZEzaVdzaSu9m7YcoENGgGuOlsgvp/qB6MlxI0fHG5M2M5aLnIEyIv
-QAMmX42eJ09jhaLr8dl2zLImyIYO0dMO0NNl5gU01cpJ5REHJ3e3oUDUJ5ZZCL51
-/VYSd/btHYRCdH/w6FSUOGGwU38LhhbeD94103gkKS5bfIui77sY0F3jRIluVQci
-PnKzRNsfl5uL8KICDJtT6uNwkhSG4ucYNAb21eo6idzyMe4qdJz1poPjmph19rnU
-oAE/0+jqOyVErBZuRAL9wbQg1Prqx1WBsOIUyi5Y7qAUt+AuDt0uf4mdRnE1yDvw
-o0CIz3XLD1YoHXqJ/Nu1By1fI2zA0Y7osSX4SzfbD0EUXqjUyy80KrvKmJaV8lMd
-1/jGHuApNQjZFwbY+RN0OTtDk7zPAETaGz/15BEmVDpq0OAVqe0XrXpQfaYwHzzq
-TsOvVYZSj2gsDbKzM8tmCkLoS+Yh5ubxaoIE2qCjvFNXZwFzqQtDgBKQhjuE54+K
-lweZ5hgUkLPf5EW0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 -----END CERTIFICATE-----
diff --git a/packages/container-vault-unseal-sgx-azure/default.nix b/packages/container-vault-unseal-sgx-azure/default.nix
index 3ec1271..a981866 100644
--- a/packages/container-vault-unseal-sgx-azure/default.nix
+++ b/packages/container-vault-unseal-sgx-azure/default.nix
@@ -12,6 +12,7 @@ nixsgxLib.mkSGXContainer {
   inherit tag isAzure;
 
   packages = [
+    teepot.container-vault-start-config
     vat.vault-auth-tee.sha
     teepot.teepot.tee_vault_unseal
   ];