diff --git a/build/deb/debian/blockbook-bch-testnet.service b/build/deb/debian/blockbook-bch-testnet.service
index d75deb7e..0c6980ff 100644
--- a/build/deb/debian/blockbook-bch-testnet.service
+++ b/build/deb/debian/blockbook-bch-testnet.service
@@ -15,6 +15,9 @@ Type=simple
 Restart=on-failure
 WorkingDirectory=/opt/coins/blockbook/bch-testnet
 
+# Resource limits
+LimitNOFILE=500000
+
 # Hardening measures
 ####################
 
diff --git a/build/deb/debian/blockbook-bch.service b/build/deb/debian/blockbook-bch.service
index 732c514e..0cb1e83f 100644
--- a/build/deb/debian/blockbook-bch.service
+++ b/build/deb/debian/blockbook-bch.service
@@ -15,6 +15,9 @@ Type=simple
 Restart=on-failure
 WorkingDirectory=/opt/coins/blockbook/bch
 
+# Resource limits
+LimitNOFILE=500000
+
 # Hardening measures
 ####################
 
diff --git a/build/deb/debian/blockbook-btc-testnet.service b/build/deb/debian/blockbook-btc-testnet.service
index 2d8208f0..cae45f0a 100644
--- a/build/deb/debian/blockbook-btc-testnet.service
+++ b/build/deb/debian/blockbook-btc-testnet.service
@@ -15,6 +15,9 @@ Type=simple
 Restart=on-failure
 WorkingDirectory=/opt/coins/blockbook/btc-testnet
 
+# Resource limits
+LimitNOFILE=500000
+
 # Hardening measures
 ####################
 
diff --git a/build/deb/debian/blockbook-btc.service b/build/deb/debian/blockbook-btc.service
index c0419764..e5ec46df 100644
--- a/build/deb/debian/blockbook-btc.service
+++ b/build/deb/debian/blockbook-btc.service
@@ -15,6 +15,9 @@ Type=simple
 Restart=on-failure
 WorkingDirectory=/opt/coins/blockbook/btc
 
+# Resource limits
+LimitNOFILE=500000
+
 # Hardening measures
 ####################
 
diff --git a/build/deb/debian/blockbook-zec.service b/build/deb/debian/blockbook-zec.service
index 4e0297e4..109a2f52 100644
--- a/build/deb/debian/blockbook-zec.service
+++ b/build/deb/debian/blockbook-zec.service
@@ -15,6 +15,9 @@ Type=simple
 Restart=on-failure
 WorkingDirectory=/opt/coins/blockbook/zec
 
+# Resource limits
+LimitNOFILE=500000
+
 # Hardening measures
 ####################
 
diff --git a/build/deb/debian/rules b/build/deb/debian/rules
index 29e4409f..12271a0c 100755
--- a/build/deb/debian/rules
+++ b/build/deb/debian/rules
@@ -6,3 +6,8 @@ DH_VERBOSE = 1
 	dh $@ --with=systemd
 
 override_dh_strip:
+
+override_dh_systemd_start:
+	dh_systemd_start --no-start
+
+override_dh_installinit:
diff --git a/contrib/backends/bcash/debian/bcash-bch.service b/contrib/backends/bcash/debian/bcash-bch.service
index d0f81c60..a4aa3770 100644
--- a/contrib/backends/bcash/debian/bcash-bch.service
+++ b/contrib/backends/bcash/debian/bcash-bch.service
@@ -20,6 +20,9 @@ Type=forking
 PIDFile=/run/bitcoin-abc/bch.pid
 Restart=on-failure
 
+# Resource limits
+LimitNOFILE=500000
+
 # Hardening measures
 ####################
 
diff --git a/contrib/backends/bcash/debian/bcash-testnet.service b/contrib/backends/bcash/debian/bcash-testnet.service
index 4894074b..50c4496b 100644
--- a/contrib/backends/bcash/debian/bcash-testnet.service
+++ b/contrib/backends/bcash/debian/bcash-testnet.service
@@ -20,6 +20,9 @@ Type=forking
 PIDFile=/run/bitcoin-abc/bch-testnet.pid
 Restart=on-failure
 
+# Resource limits
+LimitNOFILE=500000
+
 # Hardening measures
 ####################
 
diff --git a/contrib/backends/bcash/debian/rules b/contrib/backends/bcash/debian/rules
index e9b6951b..f69489df 100755
--- a/contrib/backends/bcash/debian/rules
+++ b/contrib/backends/bcash/debian/rules
@@ -4,3 +4,8 @@ DH_VERBOSE = 1
 
 %:
 	dh $@ --with=systemd
+
+override_dh_systemd_start:
+	dh_systemd_start --no-start
+
+override_dh_installinit:
diff --git a/contrib/backends/bitcoin/debian/bitcoin-btc.service b/contrib/backends/bitcoin/debian/bitcoin-btc.service
index efe31ab9..c3ca491f 100644
--- a/contrib/backends/bitcoin/debian/bitcoin-btc.service
+++ b/contrib/backends/bitcoin/debian/bitcoin-btc.service
@@ -20,6 +20,9 @@ Type=forking
 PIDFile=/run/bitcoind/btc.pid
 Restart=on-failure
 
+# Resource limits
+LimitNOFILE=500000
+
 # Hardening measures
 ####################
 
diff --git a/contrib/backends/bitcoin/debian/bitcoin-testnet.service b/contrib/backends/bitcoin/debian/bitcoin-testnet.service
index 5765a0e5..a539bd74 100644
--- a/contrib/backends/bitcoin/debian/bitcoin-testnet.service
+++ b/contrib/backends/bitcoin/debian/bitcoin-testnet.service
@@ -20,6 +20,9 @@ Type=forking
 PIDFile=/run/bitcoind/testnet.pid
 Restart=on-failure
 
+# Resource limits
+LimitNOFILE=500000
+
 # Hardening measures
 ####################
 
diff --git a/contrib/backends/bitcoin/debian/rules b/contrib/backends/bitcoin/debian/rules
index e9b6951b..f69489df 100755
--- a/contrib/backends/bitcoin/debian/rules
+++ b/contrib/backends/bitcoin/debian/rules
@@ -4,3 +4,8 @@ DH_VERBOSE = 1
 
 %:
 	dh $@ --with=systemd
+
+override_dh_systemd_start:
+	dh_systemd_start --no-start
+
+override_dh_installinit:
diff --git a/contrib/backends/zcash/debian/rules b/contrib/backends/zcash/debian/rules
index e9b6951b..f69489df 100755
--- a/contrib/backends/zcash/debian/rules
+++ b/contrib/backends/zcash/debian/rules
@@ -4,3 +4,8 @@ DH_VERBOSE = 1
 
 %:
 	dh $@ --with=systemd
+
+override_dh_systemd_start:
+	dh_systemd_start --no-start
+
+override_dh_installinit:
diff --git a/contrib/backends/zcash/debian/zcash-zec.service b/contrib/backends/zcash/debian/zcash-zec.service
index 51062409..be4457d6 100644
--- a/contrib/backends/zcash/debian/zcash-zec.service
+++ b/contrib/backends/zcash/debian/zcash-zec.service
@@ -21,6 +21,9 @@ Type=forking
 PIDFile=/run/zcashd/zec.pid
 Restart=on-failure
 
+# Resource limits
+LimitNOFILE=500000
+
 # Hardening measures
 ####################