From 682d300d15dda08d42b6819caa3a44946d295a9c Mon Sep 17 00:00:00 2001 From: Victory Osikwemhe Date: Wed, 4 Jan 2023 08:04:23 +0100 Subject: [PATCH 1/2] doc: specify that `N` should be an odd number --- engine/swarm/how-swarm-mode-works/nodes.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/engine/swarm/how-swarm-mode-works/nodes.md b/engine/swarm/how-swarm-mode-works/nodes.md index cfff0e2e0c..202be9f4bb 100644 --- a/engine/swarm/how-swarm-mode-works/nodes.md +++ b/engine/swarm/how-swarm-mode-works/nodes.md @@ -42,7 +42,7 @@ from the failure of a manager node without downtime. * A three-manager swarm tolerates a maximum loss of one manager. * A five-manager swarm tolerates a maximum simultaneous loss of two manager nodes. -* An `N` manager cluster tolerates the loss of at most +* An `N` (`N` is an odd number of manager nodes in the cluster) manager cluster tolerates the loss of at most `(N-1)/2` managers. * Docker recommends a maximum of seven manager nodes for a swarm. From 0133cf6f684a3980bebabe7e49f6dc1136cf13bc Mon Sep 17 00:00:00 2001 From: Victory Osikwemhe Date: Wed, 4 Jan 2023 15:46:28 +0100 Subject: [PATCH 2/2] doc: improve sentence relating to odd number of worker nodes Co-authored-by: David Karlsson <35727626+dvdksn@users.noreply.github.com> --- engine/swarm/how-swarm-mode-works/nodes.md | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/engine/swarm/how-swarm-mode-works/nodes.md b/engine/swarm/how-swarm-mode-works/nodes.md index 202be9f4bb..4df1685ff4 100644 --- a/engine/swarm/how-swarm-mode-works/nodes.md +++ b/engine/swarm/how-swarm-mode-works/nodes.md @@ -42,9 +42,8 @@ from the failure of a manager node without downtime. * A three-manager swarm tolerates a maximum loss of one manager. * A five-manager swarm tolerates a maximum simultaneous loss of two manager nodes. -* An `N` (`N` is an odd number of manager nodes in the cluster) manager cluster tolerates the loss of at most -`(N-1)/2` managers. -* Docker recommends a maximum of seven manager nodes for a swarm. +* An odd number `N` of manager nodes in the cluster tolerates the loss of at most `(N-1)/2` managers. +Docker recommends a maximum of seven manager nodes for a swarm. >**Important Note**: Adding more managers does NOT mean increased scalability or higher performance. In general, the opposite is true.